Question

the potential difference between the terminals of an electric heater is 250volt when it draws a current of 10 ampere what current will the heater draw if the potential difference is increased to 300 volt ?

Answer 1

When Potential Difference,V =250V, current I=10A,
By Ohm's Law
Resistance R=V/I
=250/10
=25
When the potential difference is increased to 300V, 
the current drawn by the heater will be
I=V/R
=300/25
=12A

Here is your answer.
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Answer 2

Answer:12A

Explanation:

V=250V

I=10A

R=V/I

R=250/10

=25

When the potential difference is increased to 300V,

I=V/R

I=300/25

I=12A