Question

A lamp of 100w at 200v is supplied current at 100 volts. It will be equivalent to the lamp of

Answer 1

Answer:

50 W

Explanation:

P = 100 W

V = 200 V

I = P/V = 100/200 = 1/2 = 0.5 A

Now, V = 100 V, I = 0.5 A, P = ?

P = VI = 100/2 = 50 W

Answer 2

Answer:25watts

Explanation:

We must consider formula having Resistance R instead of considering current. The reason is resistance remain constant while current drawn changes with voltage variation.