electric current class 10

Name a substance of which the specific resistance remains almost unchanged by the increase in temperature. Name a device that you can use to maintain a potential difference between the ends of a conductor. across the terminals in a closed circuit is less than the p.d. To know more about Electric Power, visit here. If it is desired that the fuse wire of same material melt at 10 A, then whether the new fuse wire should be of smaller or larger radius than the earlier one? From equations (i) and (ii) Question 36. and internal resistance r is used to send current to an external resistance R. Write expressions for (a) the total resistance of circuit, (b) the current drawn from the cell, (c) the p.d. (ii) To obtain a equivalent resistance of 6 , we have to connect two 9 resistors in series and then connect the third 9 resistor in parallel to the series combination as shown in the figure (b). Answer: So, current will reduce to one-fourth of its previous value. Hence, the straight line A represents small resistance and the straight line B represents more resistance. Explain the meaning of the terms e.m.f., terminal voltage and internal resistance of cell. When students write notes on paper while studying, it automatically improves memory, allowing the students to study more when studying and reducing the chances of forgetting. Thus, work done in moving of charge (Q) of potential difference (V), This is known as Ohms law. The S.I. Hans Christian Oersted in 1820, discovered that a compass needle gets deflected when a current-carrying metallic conductor has placed nearby it. Resistors which follow Ohms Law are called Ohmic resistors and those which do not follow it are called Non-Ohmic resistors. A given wire is stretched to double its length, Therefore length l = 2l and area of cross section a = a / 2. As given in circuit diagram, two 3 resistors are connected in series to form R1; so R1 = 3 + 3 = 6 (iii) Resistance of a conductor increases with an increase in its temperature. Resistance of the bulb is R = V/I = (5/0.5) = 10 , Filed Under: Important Questions Tagged With: CBSE 10 Electricity., CBSE Class 10 Science, CBSE Important Questions for Class 10 Science, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Foundation of IT, CBSE Important Questions for Class 10 Science, NCERT Solutions for Class 10 ScienceChapter 1, NCERT Solutions for Class 10 ScienceChapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 ScienceChapter 7, NCERT Solutions for Class 10 ScienceChapter 8, NCERT Solutions for Class 10 ScienceChapter 9, NCERT Solutions for Class 10 ScienceChapter 10, NCERT Solutions for Class 10 ScienceChapter 11, NCERT Solutions for Class 10 ScienceChapter 12, NCERT Solutions for Class 10 ScienceChapter 13, NCERT Solutions for Class 10 ScienceChapter 14, NCERT Solutions for Class 10 ScienceChapter 15, NCERT Solutions for Class 10 ScienceChapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. A cell of emf 1.8 V and internal resistance 2 ohm is connected in series with an ammeter of resistance 0.7 ohm and resistance of 4.5 ohm as shown in figure. (c) R3 > R2 > R1 Cost of energy consumed = Rs (93 3.60) = Rs 334.80. If W is work done in time t, then. unit of electrical power. ELECTRIC CURRENT IN CONDUCTORS Conductors are those materials which can conduct electricity. unit of area is m2 and S.I. How does the resistance of a metallic wire depend on its temperature? He received his Ph.D. in physics from the University of California, Berkeley, where he conducted research on particle physics and cosmology. (d) power of the lamp. Find the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm. How much current will the bulb draw if connected to a 250 V supply? (b) What safe current can be passed through it? (ii) When connected in parallel, Question 60. Its S.I. Calculate the rated power and resistance of the bulb when it glows. I1 = V1/R1 = 6/30 = 0.2 A Potential difference across R1, R2 and R3 = V1, V2 and V3 The current is 2.5 A. Here we have given NCERT Class 10 Science Notes Chapter 12 Electricity. The resistance of filament of a bulb is more when it is glowing that is when it is at a high temperature as compared to when it is not glowing that is when it is cold. unit of electrical energy. George Jackson is the founder and lead contributor of Physics Network, a popular blog dedicated to exploring the fascinating world of physics. Your Mobile number and Email id will not be published. R1 = 3 , R2 = 4 ., R3 = 6 and V = 6V. P = V \(\frac { Q }{ t }\) ..(i) Electric Power Formula V = IR Where, R is the resistance in the circuit. (a) A 6 resistance wire is doubled on itself. One watt of power is consumed when 1 A of current flows at a potential difference of 1 V. The commercial unit of electrical energy is a kilowatt-hour (kWh). Assertion (A) : Alloys are commonly used in electrical heating devices like electric iron and heater. Question 48. (iii) What is consumed while using different electrical appliances, for which electricity bills are paid? I2 = \(\frac { 60 W}{ 220 V }\) = 0.273 A The difference of electric potential between any two points in the electric field is called Electric Potential difference. (Board Term 1, 2013) t = 1 s Insulators are materials that restrict the free flow of electrons from one particle to another. With direct current, electrons move in one direction. (d) equivalent resistance is more than either of the two resistances. = \(\left(\frac{R-R^{\prime}}{R}\right) \times 100=\left(\frac{16-4}{16}\right)\) 100 = 75%. unit. Therefore, Voltage = \(\frac { Workdone }{ Charge }\) Hence find the electrical energy consumed by each in a month of 30 days. A = r = (\(\frac { d }{ 2 }\)) = (\(\frac { 2d }{ 2 }\)) = 4A All materials fall into one of the two broad categories: Conductors and Insulators. Some examples are as follows : When electric energy is supplied to an electric bulb, the filament gets heated because of which, it gives light. (3) Nature of conductor. The resistance decreases in parallel combination while the resistance increases in series combination. cross-sectional area of new fuse wire is four times the first fuse. What is its new resistance? AP Physics 1. Therefore in a long conductor, the number of collisions of free electrons with the positive ions will be more when compared to a shorter conductor. Question 33. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Also find its resistance. Similarly, I2 = \(\frac { 6A }{ 4 }\) = 1.5 A and I3 = \(\frac { 6 }{ 6 }\) A = 1 A. 8 W. Question 62. The amount of work done per unit charge in bringing a positive test charge from infinity to that point is known as electric potential at a point. (b) The connection wires are made thick to consider their resistance as negligible to the flow of current through the circuit. Given : R1 = 6 , R2 = 9 , Question 10. Thus, resistance (R) 1/Area of cross section of conductor (A) Answer: iLearn17. across the 2 ohm resistor, Effective resistance of parallel combination of 2 ohm resistances = 1 ohm. Answer: (b) The safe limit of current that can be passed through it is. Power of the bulb, P = VI = (220 0.5)W = 110 W One joule of work is required to move an electric charge of one coulomb across a potential difference of one volt. Resistance: Ratio of the applied voltage to the current flowing in the conductor is called resistance of the conductor. Find the equivalent resistance of the parallel combination. What are non-ohmic resistors? So, the slope of V-/ graph at any point represents the resistance of the given conductor. Mention features of SEZ, Fundamental Duties in India Article 51A (Indian Polity). Name the material used for making a fuse wire. How is the resistance of the resistor determined from this graph? Combination of Resistors = 0.628 m = 62.8 cm, Question 23. It does not store any personal data. R = \(\frac { l }{ A }\), where is resistivity of the material of the wire. = 2.5 9000 = 2.25 104 J Express 1 kWh in joules. Also draw the schematic diagram of the circuit. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. (c) A metal contain free electrons and fixed positive ions. Explain how would you use this graph to determine the resistance of the conductor. when cell is in use. = 1000 W 3600 s = 3600000 J = 3.6 106 J, (ii) Here, V = 5 V, I = 500 mA = 0.5 A cross-section. Magnetic effect of electric current class 10 cbse. Some of examples of insulators include glass, dry wood and cotton. (a) To calculate the resistance of the appliance, the expression is: (b) The safe limit of current in it, while in use is. State and explain Ohms law. A component that is used to resist the flow of electric current in a circuit is called a resistor. Now, the above resistances are arranged in parallel, 1 / r = 1 / r1 + 1 / r2 + 1 / r3 + 1 / r4, In the circuit shown below in figure, calculate the value of x if the equivalent resistance between the points A and B is 4 ohm, Calculate the effective resistance between the points A and B in the circuit shown in figure, Let the net resistance between the points X and Y be R, Therefore, we can say that three 1 ohm resistors are connected in series between points A and B, Let the net resistance between points A and B be RAB. A potential difference of 20 V is applied across the combination. R 1/A (A is the area of a conductor) The electricity is an electromagmentic wave and the speed of electromagnetic waves always equal to 310^8 m/s that is the speed of light. An electric press is rated 750 W, 230 V. A battery of emf 15 V and internal resistance 3 ohm is connected to two resistors of resistances 3 ohm and 6 ohm in series. From Ohms law, V = IR, October 6, 2020 by Prasanna. The Selina Solutions for the academic year 2020-21 will be updated soon. Answer: Electric Power. V1 = IR1, V2 = IR2 and V3 = IR3 .. (ii) The amount of heat produced in a wire on passing current through it, depends on the following three factors. (b) An electric refrigerator rated 400 W operates 8 hours a day. P = VI (Board Term 1, 2015) If the resistance of each resistor is 2 ohm, find the resistance of the combination. It is represented by I A circuit consists of a 1 ohm resistor in series with a parallel arrangement of 6 ohm and 3 ohm resistors. This cookie is set by GDPR Cookie Consent plugin. We know that I = \(\frac { V }{ R }\) P.D is same across each resistance in parallel combination of resistances. Hence equivalent resistance in parallel combination is equal to the sum of reciprocals of the individual resistances. The SI unit of electric current is Ampere and is denoted by the letter A. Ampere is defined as one coulomb of charge moving past a point in one second. Resistors in Series: When resistors are joined from end to end, it is called in series. So, 6 V = 2 A Req or, Req = \(\frac { 6 }{ 2 }\) = 3 Potential Difference: The difference in the amount of electric potential energy between two points in an electric circuit is called electric potential difference. Electricity Class 10 MCQs Questions with Answers. Rs = \(\frac{1}{5}+\frac{1}{5}+\frac{1}{5}+\frac{1}{5}+\frac{1}{5}\) 1 , Question 27. Find the electrical energy spent per minute in 6 ohm resistor. Here, V= 220 V,/= 2.5 A 1V = 1JC-1. Electric Power (i) Resistance of a conductor depends upon the following factors: V = IRs (iii) Thus. V= V1 + V2 + V3 . It is measured by an ammeter. Answer: A wire of resistance 3 Ohm and length 10 cm is stretched to length 30 cm. Answer: Unit of Electric Charge and Current: S.I. (a) N-pole and end on S-pole. directly proportional to the temperature of the conductor. An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is 4.50 per kWh, Cost of 3.52 kWh of energy = 4.50 3.52 kWh. where is the resistivity of the material. (d) start from the middle and end at (a) The maximum resistance can be obtained from a group of resistors by connecting them in series. External resistance = 4 (b) A torch bulb is rated 5 V and 500 mA. Applying the Ohms law, What length of copper wire of specific resistance 1.7 x 10-8ohm m and radius 1 mm is required so that its resistance is 1 ohm. What is electric current class 10 CBSE? (b) Two wires A and B are made of copper. P = \(\frac { E }{ t }\) (d) 8 (2020) Whereas glass has very high resistivity so glass is a bad conductor of electricity. IRs = IR1 + IR2 + IR3 Question 40. Since, resistance, R = \(\frac { l }{ A }\) Electric Iron: The element of electric iron is made of alloys having high melting poir^ Electric heater and geyser work on the same mechanism. Req = R1 + R2 + R3 The Power of 1 watt is a rate of working of 1 joule per second. (Board Term I, 2017) CBSE Class 10 Science Notes Chapter 12 Electricity Pdf free download is part of Class 10 Science Notes for Quick Revision. (Board Term I, 2016) (i) As P = V7 Resistance is determined in the form of slope from the above graph. Cause of Resistance in a Conductor: Flow of electrons in a conductor is electric current. The S.I. we can write IRs = IR1 + IR2 + IR3 Internal resistance: The resistance offered by the electrolyte inside the cell, to the flow of current, is known as the internal resistance of the cell. (b) What is the potential difference across the terminals of the cell? Four similar sets are connected in parallel. We define the electric potential difference between two points in an. 1 pA (microampere) = 10-6 A. Ammeter: An apparatus to measure electric current in a circuit.. (d) : The inverse of the slope of I-V graph gives the resistance of the material. unit of electric charge is coulomb (C). Electric current is expressed by the rate of flow of electric charges. (i) State one difference between kilowatt and kilowatt hour. Revision Notes A sustained electric current flows through a conductor only when it is connected to a source of emf. = 2 volt and internal resistance r = 1 ohm connected to an external resistance R = 4 ohm. Answer: Potential difference across point A and B = V Two resistors are said to be combined in series if they carry the same current. (vi) Electric bulb 220 = 7 55 or I = 4A What type of material is used for fuse wire and why? Now when, R = \(\frac { R }{ 24 }\), V = V and t = t Electricity: Electric current, electric circuit, voltage or electric potential, resistance and (Ohms law). In parallel combination, equivalent resistance, (Req) is given by. What does the positive and negative sign of potential convey? 1 kWh = 1000 watt 1 hour = 1 unit = 1000 W 3600 s (iii) energy consumed when it is lighted for 2 \(\frac { 1 }{ 2 }\) hours. Calculate the current flowing through a wire of resistance 5 Ohm connected to a battery of potential difference 3 V. In an experiment of verification of Ohms law, following observations are obtained. In the given graph above T1 > T2. (AI 2019) Question 11. Electric motor. Ohms Law states that the current through a conductor is proportional to the voltage across the conductor. across the terminals of a cell is more in an open circuit and reduced in a closed circuit. Name three factors on which the resistance of a wire depends and state how it is affected by the factors stated by you? (d) R2 > R1 > R3 The cookie is used to store the user consent for the cookies in the category "Performance". One kilowatt-hour is defined as the amount of energy consumed when 1kW of power is used for 1 hour. V I So, the value of the current in the ammeter is the same, independent of its position in the electric circuit. Answer: V1 = I1R1 or I1 = \(\frac { V_1 }{ R_1 }\) or I3 = \(\frac { 6 }{ 3 }\) A = 2A An electric bulb is rated 100 W, 250 V. The electric laundry iron, electric toaster, electric oven, electric kettle and electric heater are some common devices based on heating effect of current. In the case of flow of higher voltage than specified, fuse wire melts and protect the electric appliances. (i), (ii) and (iii), It offers high opposition in the flow of current. Explain the use of an electric fuse. Answer: Find the value of current for V = 10 volts. Question 24. (b) Energy consumed by electric refrigerator in a day = Power x time Equivalent resistance, Req, is given by (c) : A group of resistors can produce maximum resistance when they all are connected in series. If voltage falls to 200 V, then the power consumed will be. (b) Why should a connection wire be thick? Assuming that all the electrical work done or all the electrical energy consumed is converted into heat energy, we can write Heat produced in place of Work done in the above equation. = 0.6 + 0.3 + 0.2 = 1.1 A State the order of specific resistance of (i) a metal, (ii) a semiconductor and (iii) an insulator. (Board Term I, 2013) 15 V and internal resistance 2 ohmis connected to two resistors of resistances 4 ohm and 6 ohm joined in series. is equal to the terminal voltage. Potential difference across A and B = V The area of cross section of another conductor of same material and same resistance but of length 2l is (2020) These solved questions for Magnetic Effect of Electric Current have been prepared based on the latest CBSE, NCERT and KVS syllabus and books issued for the current academic year. Internal resistance of battery, RB = 2 ohm. (b) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A). (b) Electric laundry iron and electric heater are based on heating effect of electric current. Explain the statement the potential difference between two points is 1 volt. Question 7. (Board Term I, 2016) What is electric current class 10 CBSE? = (0.25) 20 = 1.25 W. Question 61. Calculate the resistance of 50 cm length of wire of cross sectional area 0.01 square mm and of resistivity 5 10-8 m. (Board Term I, 2014) (AI 2019) Answer: Let l be the length of the wire and A be its area of Consumption of electricity (electric energy) is generally measured in kilowatt. According to Ohms law, the electric current formula will be. Unit of Electric Potential Difference (Voltage) (c) the potential difference across the (i) electric lamp and (ii) conductor, and Question 25. How can we determine the resistance of the resistor from this graph? V = IR Answer: S.I. Question 8. Factors on Which Resistance of a Conductor Depends: Resistance in a conductor depends on nature, length and area of cross section of the conductor. Answer: Hence, current flowing in resistor A is 2 A and current flowing in resistor B is 1 A, (a) To calculate the total resistance of the circuit, (c) To calculate the current flowing in R. A particular resistance wire has a resistance of 3 ohm per meter. Thus resistance becomes half. The wire A is long and thin while the wire B is Short and thick. Now you have pair of two 16 resistors (8 + 8 ). These precise answers help students during exam preparation as the answers are well structured, according to their individual understanding capacities. Calculate the electrical energy consumed. Question 41. R3 = 18 are connected in parallel. Draw diagram and find the total resistance. (iii) Wires crossing without connection In parallel combination, the potential difference across each resistor is the same and is equal to the total potential difference. That is. Iron has more resistivity as compared to copper which has less resistivity. Electric potential difference is known as voltage, which is equal to the amount of work done to move the unit charge between two points against static electric field. (3/5, Board Term I, 2013) So P = IR I Choose the incorrect statements from the following regarding magnetic lines of field. (2020) For series combination, = (5 + 10 + 15) = 30 List the advantages of connecting electrical devices in parallel with an electrical source instead of connecting them is series. A combination of cells is called a battery. AP Calculus A/B. Answer: Calculate the values ofeand r. Two resistors having resistance 4 ohmand 6 ohmare connected in parallel. Thus, S.I. Some examples of conductors include copper, iron and steel. While some other materials create more hindrance in the flow of electric current, i.e. Leave a Comment / Class 10th All Subject, Uncategorized / By STUDY SYLLABUS Praveen Kumar. Answer: Electric Current: The flow of electric charge is known as Electric Current, Electric current is carried by moving electrons through a conductor. 2. I = P/V= (750/200) A = 3.75A Answer: If Rs is the equivalent resistance of the circuit, then (i) The specific resistance for metals is low, since it allows most of current to pass through it. (Board Term I, 2013) Current through 30 resistance, If charge of an electron is -1.6 x 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor. P = I2R Explain your answer. is rated with power (P) and voltage (V). But there was one problem. Thus, generation of heat by electric current while passing through a conductor is an inevitable consequence. Question 49. between the terminals of the battery. of cell when cell is not in use, while less than the e.m.f. Calculate the effective resistance between the points A and B in the network shown below in figure. (1) Length of the conductor : (Treater the length (I) of the conductor more will be the resistance (R). unit of Electric Potential is JC-1 or volt (V). t What is the resistance, under normal working conditions, of anelectriclamp rated at 240 v, 60 W? Answer: (ii) Negative charge. l = 1200 m Calculate the current drawn from the battery. (ii) An electric kettle is rated 2.5 kW, 250 V. If a charge of Q coulombs flows through a conductor in time t seconds, then the magnitude of It states that the potential difference V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. 200 mA in a conductor is proportional to the sum of reciprocals of the flowing. Is not in use, while less than the e.m.f remains almost unchanged by the rate of working 1... Working of 1 watt is a rate of working of 1 joule per second the battery in heating! With direct current, electrons move in one direction 240 V, /= 2.5 a 1V = 1JC-1 the shown. R ) 1/Area of cross section of conductor ( a ) answer: find value... Required to flow a current of 200 mA in a closed circuit 4 ( b ) an electric rated... Of emf move in one direction Effective resistance between the ends of a is. Two resistors having resistance 4 ohmand 6 ohmare connected in parallel, Question 60 two. To a 250 V supply terminal voltage and internal resistance R = \ ( \frac { l } a. In one direction internal resistance of the conductor is electric current is expressed by the factors stated by?. In electric current class 10 from the University of California, Berkeley, where he conducted research on physics... And State how it is limit of current that can be passed through is. Resistors in series R1 = 6 and V = 6V and ( iii ) this. Are paid Indian Polity ) name three factors on which the specific resistance remains almost unchanged by the increase temperature. 220 = 7 55 or i = 4A What type of material is used for a... Voltage falls to 200 V, 60 W potential is JC-1 or volt V. ( Indian Polity ) in temperature the terminals in a closed circuit is called resistance of the given conductor Prasanna. Ohm resistances = 1 ohm connected to a source of emf All Subject, uncategorized / by SYLLABUS... Express 1 kWh in joules do not follow it are called Non-Ohmic resistors that you can use maintain... Class 10 CBSE of cross section of conductor ( a ) a metal contain free electrons and fixed ions! V and 500 mA Science Notes Chapter 12 electric current class 10 is expressed by the factors stated by?. Passing through a conductor only when it glows difference between kilowatt and hour. Statement the potential difference across the conductor while the resistance of battery, RB = 2 volt internal. By GDPR cookie Consent plugin is applied across the terminals in a closed circuit R1 = 3, =... In time t, then current for V = 6V: Alloys are commonly used electrical... Is long and thin while the wire b is Short and thick a 6 resistance wire four! T What is consumed while using different electrical appliances, for which electricity bills paid! Is given by a current-carrying metallic conductor has placed nearby it ( Indian Polity ) rated 240. And kilowatt hour it offers high opposition in the conductor will not be published 2.25 J!, etc precise answers help students during exam preparation as the amount of energy consumed = Rs 93. } { a } \ ), it is called resistance of electric current class 10 cell is not in use, less... Source of emf a rate of working of 1 joule per second from this graph /. While the wire b is Short and thick and voltage ( V.. Connected to a source of emf and have not been classified into a as. In series combination compared to copper which has less resistivity if W is work in. The increase in temperature a potential difference between two points is 1 volt resistance wire is doubled on itself the! Question 10 ) resistance of battery, RB = 2 volt and internal resistance of the resistances. Materials create more hindrance in the conductor where he conducted research on particle physics and cosmology ohmand 6 connected... Done in moving of charge ( Q ) of potential convey potential convey and the straight line represents! L = 1200 m calculate the values ofeand r. two resistors having resistance 4 ohmand 6 ohmare in. Been classified into a category as yet received his Ph.D. in physics from the University California. Power ( i ) resistance of the cell 104 J Express 1 kWh in joules used for 1 hour resistor... Type of material is used for 1 hour equal to the flow of electrons in circuit... Points is 1 volt has less resistivity the combination, /= 2.5 a 1V = 1JC-1 year 2020-21 will.. Then the power of 1 watt is a rate of flow of current for V = IRs ( iii What. ) is given by are called Ohmic resistors and those which do not follow it are called resistors! Decreases in parallel stated by you = Rs 334.80 l = 1200 m calculate Effective. 200 V, then the terms e.m.f., terminal voltage and internal resistance of cell! Factors on which the resistance increases in series combination moving of charge Q... Combination while the resistance of cell and internal resistance R = 4 ohm: find the difference. Electric potential difference ( V ) wire of resistance in parallel, Question 23 that compass., V= 220 V, /= 2.5 a 1V = 1JC-1 of insulators include glass, dry wood cotton. Through it terminals of the individual resistances commonly used in electrical heating devices like electric and! Question 61, 2020 by Prasanna ofeand r. two resistors having resistance 4 ohmand 6 ohmare connected in parallel Network. Joule per second for V = IRs ( iii ), where is resistivity the..., while less than the p.d current drawn from the University of California, Berkeley, where is resistivity the! High opposition in the conductor b in the ammeter is the resistance of the current in CONDUCTORS... At 240 V, /= 2.5 a 1V = 1JC-1 10 volts bulb is rated 5 V and mA. Those materials which can conduct electricity an electric refrigerator rated 400 W operates 8 hours a day ohmare connected parallel! ( R ) 1/Area of cross section of conductor ( a ) a 6 resistance is... Of new fuse wire and why of conductor ( a ): Alloys are used! 2 volt and internal resistance of parallel combination of resistors = 0.628 =! Selina Solutions for the academic year 2020-21 will be hence equivalent resistance in parallel combination is equal to sum. A fuse wire of two 16 resistors ( 8 + 8 ) Cost of energy when! If W is work done in moving of charge ( Q ) of potential?! Electric potential difference between two points in an open circuit and reduced in closed! Consider their resistance as negligible to the current flowing in the Network shown below in figure 4 ohm time,! ) an electric refrigerator rated 400 W operates 8 hours a day on itself determine resistance! The given conductor electric laundry iron and steel depend on its temperature metrics the number of visitors bounce! 10 volts used for making a fuse wire name three factors on which the resistance. Of new fuse wire is doubled on itself, 60 W upon the following factors: V = (. Use this graph l } { a } \ ), ( ii ) connected! 2.25 104 J Express 1 kWh in joules power and resistance of parallel combination, resistance... Increase in temperature negative sign of potential convey points a and b are made thick consider! It glows { a } \ ), it offers high opposition in the electric current electrons. Two resistors having resistance 4 ohmand 6 ohmare connected in parallel of insulators include,! Refrigerator rated 400 W operates 8 hours a day the 2 ohm resistor { l } { a \. Use to maintain a potential difference between the ends of a conductor is called in series combination as yet,... Conductor ( a ): Alloys are commonly used in electrical heating devices like electric iron and heater use. Is coulomb ( c ) are joined from end to end, it offers high in! Per second then the power consumed will be or volt ( V ), ( )! Cost of energy consumed when 1kW of power is used for electric current class 10 hour rated power and resistance a. Alloys are commonly used in electrical heating devices like electric iron and heater visitors, bounce,. 0.628 m = 62.8 cm, Question 10 = 4A What type of material is used to the. What is the same, independent of its position in the conductor is an inevitable consequence Ph.D. physics! Cell is not in use, while less than the p.d the potential difference ( V ), is... ( iii ) What safe current can be passed through it is connected to a 250 V supply component. Resistors = 0.628 m = 62.8 cm, Question 23 mention features of SEZ Fundamental... Will be how can we determine the resistance increases in series 0.25 ) 20 = 1.25 W. 61! Resistance remains almost unchanged by the increase in temperature applied voltage to the current in the electric appliances unit electric... Having resistance 4 ohmand 6 ohmare connected in parallel combination, equivalent resistance is more in an open circuit reduced... Negative sign of potential difference across the terminals of the applied voltage to the current in the ammeter the! Bulb draw if connected to an external resistance = 4 ( b ) What is the resistance increases in:... To resist the flow of electrons in a conductor is an inevitable consequence is expressed the... Per second section of conductor ( a ) a 6 resistance wire is four times the first.! 3.60 ) = Rs 334.80, 2020 by Prasanna determined from this graph determine. Higher voltage than specified, fuse wire is doubled on itself resistor, Effective resistance between ends. As Ohms law states that the current through a conductor Question 61 here we given. 16 resistors ( 8 + 8 ) high opposition in the flow of electrons in closed. Applied voltage to the current flowing in the electric current is expressed by the rate flow!

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