out of 60W and 40W lamps which one has a higher electrical resistance when in use

Asked by  | 15th Sep, 2010, 06:17: AM

Expert Answer:

Let us assume that the two bulbs are connected to the same supply. Let us say the value of the supply is voltage V. Now for 40 W bulb
Resistance of 40W bulb = V*V/40
Similarly
Resistance of 60W bulb = V*V/60
 
Since the denominator of first is less, hence the Resistance of 40 W bulb will be MORE than the resistance of 60W bulb.

Answered by  | 15th Sep, 2010, 01:41: PM

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