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प्रश्न
Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.
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उत्तर
R = 75 Ω, i = 2A, t = 2 minutes = 2 × 60 s = 120 s
Heat energy produced in the coil, H = i2Rt
= 22 × 75 × 120
= 300 × 120 = 36000 J
संबंधित प्रश्न
When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:
(a) 0.3
(b) 3
(c) 4
(d) 12
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(a) conductor
(b) resistor
(c) superconductor
(d) insulator
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Give the law of combination of resistances in series.
State the order of resistivity of (i) a metal, (ii) a semiconductor and (iii) an insulator.
Name the material of wire used for making standard resistances. Give a reason.
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In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.
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