Question

a potential difference of 10 V is needed to make a current of 0.02A flow through a wire. What potential difference is needed to make a current of 250mA flow through the same wire?

Answer 1

we know that R=v/I and we know resistance doesn't change with current or voltage. so 10/0.02=500 ohm. now v=RI.so R=500×250/1000=125V

we divided it by 1000. because 1mA=1/1000A

Answer 2

Answer:

first of all, we will find resistance

R = V/I

= 10/0.02

= 500 ohm

now we have to find potential difference

V = IR

= 250/1000 x 500

= 125 Volts

hence, SOLVED....