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Q.

196 J of heat is produced per second in a 4 Ω resistance. Find the potential difference across the resistor.

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a

18 V

b

38 V

c

28 V

d

8 V

answer is C.

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Detailed Solution

Given: Heat produced, H = 196 J, R = 4 Ω, t = 1 s, V =?

According to joule's law of heating:

H= I2Rt

 The current through the resistor will be:

I=H/(R×t)
I=196/(4×1)
I=7 A

The potential difference across the resistor will be:

V = IR

V = 7 A × 4 Ω = 28 V.

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196 J of heat is produced per second in a 4 Ω resistance. Find the potential difference across the resistor.