Q. 274.7( 3 Votes )

A bulb is made using two filaments. A switch selects whether the filaments are used individually or in parallel. When used with a 15 V battery, the bulb can be operated at 5W, 10W or 15W. What should be the resistances of the filaments?

Answer :

and

Given, Voltage of the battery,


Power operated P=5W, 10W or 15W


We know,


Now,





The parallel combination of resistances is always less than individual resistances. Therefore, has to be parallel combination while and are the resistances.


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