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Alternating Current Applied to an Inductor

A 120 V, 60 W...

Question

A 120 V, 60 W lamp is to be operated on 220 V, 50 Hz supply mains Calculate what value of pure inductance which would be required so that the lamp runs on correct value of power

A

1.174

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B

2.348

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C

3.522

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D

4.696

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Solution

The correct option is A 1.174
A 120 V, 60 W lamp is to be operated on 220 V, 50 Hz supply mains
$V_{L} = 2 π η l i = 184.4 v$
$L = 1.174 H$

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