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A certain flash-light can use a 10ohm bulb or a 5ohm bulb. Which bulb should be used to get the brighter light? Which bulb will discharge the battery first?


 Q: A certain flash-light can use a 10ohm bulb or a 5ohm bulb. Which bulb should be used to get the brighter light? Which bulb will discharge the battery first?

Ans: A bulb of 5 ohm gives brighter light because low resistance gives rise high current according to the equation

V=IR
 Power I2 R
High current and low resistance of 5 ohm bulb will discharge the battery first.

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