Question

100 j of heat is produced each second in a 4 ohm resistance. find the potencial difference across the resistors.

Answer 1

Heat produced ≈ 100J

R ≈ 4 ohms

time taken,t ≈ 1 sec

V ≈ ?

Using the formula , H ≈ I²Rt

         I ≈ √H/Rt

            ≈ √100/4×1

          ≈ √100/4

          ≈ √25

      I  ≈ 5A

potential difference across the resistor

V ≈ IR

  ≈  5A × 4 ohms

V  ≈ 20v