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Question

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 5 W, 10 W or 15 W. What should be the resistances of the filaments ?

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Solution

The various resistances of the bulbs =v2p

Resistances are

(15)25,(15)210,(15)215=45,22.5,15

Since two resistances when used in parallel have resistances less than both. The resistances are 45 & 22.5


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