Question

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 120 V?​

Answer 1

Answer:

Given :

Potential Difference of heater = 60v

current I=4A

Resistance =R?

By Ohm's law :

V=IR

R=V/R

=60/4=15 ohms

Now if potential is increased to 120 V

I=?

V=IXR

I=V/R

=120/15

=8 A

Hence current drawn by heater is 8A

Explanation:

Answer 2

V=60VI=4A

R=

I

V

=

4

60

=15Ω

When potential difference is increased to 120V

I=

R

V

=

15

120

=8A

The current through the heater becomes 8A