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Q.

A projector lamp can be used at a maximum voltage of 60V, its resistance is 20 Ω, the series resistance (in ohm) required to operate the lamp from a 75 V supply is

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a

2

b

3

c

4

d

5

answer is D.

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Detailed Solution

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The excess voltage of 15 V should drop across the series resistance . 

Now current through 20 Ω = 6020=3 A 

hence resistance in series = 153=5 Ω

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A projector lamp can be used at a maximum voltage of 60V, its resistance is 20 Ω, the series resistance (in ohm) required to operate the lamp from a 75 V supply is