Question

the potential difference between the terminals of an electric heater is 30 volt when it draws a current of 4 ampere from the source what current will the heater draw if the potential difference is increased to 120 volt

Answer 1

v=ir
30/4=r
r=7.5omega

->v=ir
120/7.5=16ampere

Answer 2

Answer:We Know that,

V=IR

So,Here Given is :- V= 30 volt

I = 4 Ampere

Then, Puttting these value in equation,

V=IR

R = V/I

R = 30/4 = 7.5 Ohm

Then,The current after the increasing Potential difference to 120 volt

We have :- R= 7.5 Ohm

V = 120 volt

I = V/R

I = 120/7.5 = 16 Ampere...

Hence,

The Current will the heater draw if the pot. Diff. increased 120 volt is 16 Ampere..