Question

Electric room heater draw current of 24A from 120V supply line what current will this room heater draw when connected to 240V supply line

Answer 1

Let's first find the resistance of the heater from the Ohm's Law:

$$R=\dfrac{V}{I} = \dfrac{120 V}{24 A} = 5 \Omega.$$

Then, using the Ohm's Law, we can find the current through the heater when it connected to 240 V supply line:

$$I = \dfrac{V}{R} = \dfrac{240 V}{5 \Omega} = 48 A.$$

Answer:

$I = 48 A.$