Question

If 240V voltage is applied to an electric heater , 2 A curcurr passes through it. Find the current flowing in the heater if 120V voltage is applied to it and also calculate the resistance of the coil of heater.

Answer 1

Given,
when 240V is applied , 2A current is flowing
Applying ,V=IR
240= 2×R
=> R =240/2
=> R= 120 ohm.

Now when 120 V is applied
Again using V=IR
120 = I ×120
=> I = 120/120
=> I = 1A

1 A current flows when 120 V is applied.