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A lamp of 100 W works at 220 volt .W...

A lamp of 100 W works at 220 volt .What is its resistance and current capacity ?

Text Solution

Verified by Experts

P=100W
V=220V
R= ?
I=?
`R=(V^(2))/(P)`
`R=(220xx220)/(100)`
`R=(48cancel400)/(cancel100)`
`R=484Omega`
`I=(P)/(V)`
`=(100)/(220)`
`I=0.45A`
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