1.

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?

Answer»

Solution :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`


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