An electric bulb is rated 240 V and 40 W find the resistance of the filament and current through it when used at the rated voltage
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p= v^2 / r
r = 240×240/ 40
R= 1440 ohm
SINCE,
rated volatage changed or npt may be the question os half
r = 240×240/ 40
R= 1440 ohm
SINCE,
rated volatage changed or npt may be the question os half
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