Question

An electric heater draws a current of 10a when connected to a 200 v supply. what current will the heater draw when it is connected to 220 v supply.

Answer 1

R=V/I 

Therefore,

R= 200/10 
=20 ohms 

R remains same, 
So,

20 = 220/ I 

I = 220/20

= 11 A

Answer 2

R=V/I

200/10=R

20=R

Resistance remains the same.

20=220/I

I=220/20

I=11 A