An electric lamp is marked 20W,220V. It is used for 10hrs daily.
A} CALCULATE THE RESISTANCE WHILE GLOWING
B} NUMBER OF UNITS CONSUMED EVERYDAY
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Answer:
P=V²/R=20=220×220/R
R=220×220/20=220×11=2420ohms
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20W lamp consumes 0.2 kWh electricity if it’s glow for 10 hours.
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