Question

A current of 1A is passed through a resistor of resistance 20 ohm for 1 minute. Find the heat produced in the resistor ?

Answer 1

Answer:

1200 J

Explanation:

Q = i^2 × R × t

= 1^2 × 20 ×60

=1200 J

Answer 2

5A of currents means 5 coulombs of charge is passing through the cross section in 1 second,

Thus, number of electron passing through the cross-section in 1 sec = 5/1.60x10^-19 = 3.125x10^19 electrons are passing through that cross section in 1 second.

So in 4 minutes, 3.125x10^19 x 240 electrons will pass through the cross section = 75 x 10^20 electrons

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