Question

The potential difference between the terminals of an electric heater is 60v when it draws a current of 4a from the source find the resistance

Answer 1

Resistance is equal to potential difference divided by current .
R = V/I
Whr, V = 60 V
I = 4 A
R=60/4
R = 15 ohm
So electric heater's resistance is 15 ohm.
Hope this helps.