Question

100j of heat is produced each second in a 4 OHM resistance find the potential difference across the resistor

Answer 1

${i}^{2} Rt = 100 \\ iR = V \\ {V}^{2} \div R = 100 \\ {V}^{2} = 100\times R \\ {V}^{2} = 400 \\ V = 2 \sqrt{100} v$

Answer 2

Here, it is given H = 100J, t = 1sec, R = 4ohms,

We know that according to Joule's law of heating

H = I2RT

100 = I2×4×1

100/4 = I2

I = 5amp

Again we know that

V = IR

V = 5X4

= 20V