Question

find the potential difference required to flow a current of 200mA in a wire of resistance 20 ohm

Answer 1

From

V=IR

Here , I=200mA

=0.2 A

Now, V =0.2×20

=4

Answer 2

Here I = 200mA= 200*1/1000A=0.2A
Now

V = ir = 0.2*20=4Volt