Question

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35. A p.d. of 10V is needed to make a current of 0.02 A flow through a wire. Wiat
p.d. is needed to make a current of 250mA flow through the same wire?
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Answer 1

Answer:

125V

Explanation:

V₁ = 10 V

I₁ = 0.02 A

R = V/I = 10/0.02 = 10*100/2 = 1000/2 = 500 Ohm

Now,

I₂ = 250 mA = 250/1000 = 1/4 = 0.25 A

R remains the same, ie, 500 Ohm

So, new p.d, V₂ = I*R = 0.25 * 500 = 500/4 = 125 Volts