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16/07/2021 4:57 pm
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A p.d. of 10 V is needed to make a current of 0.02 A flow through a wire. What p.d. is needed to make a current of 250 mA flow through the same wire?
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16/07/2021 4:59 pm
In first case,
I = 0.02 amp, V = 10 volt
V = IR
10 = 0.02 x R
R = 10/0.02 = 500 ohm
In second case,
I = 250 x 10-3 amp, R = 500 ohm
V = IR
V = 250 x 10-3 x 500
V = 125 volt.