Bulb marked as 40w and 200v, if supply voltage is 100v than its power will will be
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P=v^2/R
R=v^2/P
=200×200/40
=1000ohm
now power=v^2/R
=100×100/1000
=10w
hope it helps.
R=v^2/P
=200×200/40
=1000ohm
now power=v^2/R
=100×100/1000
=10w
hope it helps.
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