The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

Answer: Option A

V = 60V and I = 4A
R = V/I
​= 60/4
​=15Ω
When potential difference is increased to 127.5 V
I = V/R
​= 127.5/15
​= 8.5 A
The current through the heater becomes 8.5 A.