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Question

Two electric bulbs P and Q have their resistances in the ratio of 1:2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.

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Solution

Given: Bulb resistance are in ratio 1:2(P:Q)
We know that, Power=I2R
Taking ratio, PPPQ=I2RPI2RQ
Since bulbs are connected in series current flowing will be same so IP=IQ=I
Taking ratio, PPPQ=RPRQ=12

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