An electric bulb is rated 60w 240v calculate its resistance

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An electric bulb is rated at 60W,240V. calculate resistance. If the voltage drops to 192V,calculate the power consumed and the current drawn by the bulb.(assume that resistance of bulb remains unchanged).

Answered by admin @


Power rating = 60W Voltage rating = 240V Resistance = v^2/P =
240×240/ 60
R = 960 ohm
Voltage across the bulb = 192 volt
power consumed =
voltage^2/R=
192×192/ 960= 384 watt
current across the bulb = voltage / R
= 192/ 960= 0.2 A

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