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 of heater when in use.
According to the question
Potential Difference (V) = 60V
Current drawn (I) = 4A
By Ohm’s Law
V = IR
⇒ 60 = 4 × R
⇒ 
Hence the resistance is 15Ω.
14