Question

100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:
(a) 30 V
(b) 10 V
(c) 20 V
(d) 25 V

Answer 1

Explanation:

Given :

Heat = 100J

Resistance = 4 ohm

Potential diffrence = x V ( let )

since ,

Heat = (V^2 / R ) * t

100 = ( x^2 / 4 ) * 1

√ 25 = x

x = 5 V

Answer 2

Answer:

the answer is 20v (c)

Explanation:

Given:

H = 100J, t = 1sec, R = 4ohms,

We know that

H = I^2RT

100 = I2 X 4 X 1

100/4 = I2

I = 5 amp

V = IR

V = 5 X 4

 = 20 V

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