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

Explanation

According to the Ohm.s law,
`R = V/I`
So, `R = 10 /0.02`
`=500 Omega`
Now, to make a current of
250 mA = `250 xx 10^(-3) A` to flow through the same wire, the required potential difference is
`V = IR = 250 xx 10^(-3) xx 500 = 125V`