a bulb of 100W and anather bulb of 200W , rated supply
voltage 230v.when supply voltage is reduced to 100v,which
bulb will give more light? and why with calculation?

Answer Posted / nimish

P = V*i

For 100w bulb i = 100/230 = 0.4 A

For 200w bulb i = 200/230 = 0.8 A

Now voltage is reduced to 100 V , i = 100 / 100 = 1 A

i = 200 / 100 = 2 A

So, 200 W bulb will give more light.

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