An electric lamp is marked $60 W, 220 V$ . The cost of kilo watt hour of electricity is $R s . 1.25$ . The cost of using thing lamp on $220 V$ for $8 h r s$ is:

R s . 0.25

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R s . 0.60

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R s . 1.2

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R s . 4.00

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Solution

The correct option is B $R s . 0.60$
Given:
Power, $P = 60 W$
Time, $t = 8 h r s$

Energy consumed per day, $E = P t = 60 \times 8 = 480 W h r = \frac{480}{1000} = 0.48 k W h r$
Hence total cost, $C = 0.48 \times 1.25 = R s . 0.60$

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An electric lamp is marked 60 W, 220 V. The cost of kilo watt hour of electricity is Rs. 1.25. The cost of using thing lamp on 220 V for 8 hrs is:

The correct option is B Rs. 0.60Given:Power, P=60 WTime, t=8 hrsEnergy consumed per day, E=Pt=60×8=480 Whr=4801000=0.48 kWhrHence total cost, C=0.48×1.25=Rs.0.60

An electric lamp is marked $60 W, 220 V$ . The cost of kilo watt hour of electricity is $R s . 1.25$ . The cost of using thing lamp on $220 V$ for $8 h r s$ is:

The correct option is B $R s . 0.60$
Given:
Power, $P = 60 W$
Time, $t = 8 h r s$

Energy consumed per day, $E = P t = 60 \times 8 = 480 W h r = \frac{480}{1000} = 0.48 k W h r$
Hence total cost, $C = 0.48 \times 1.25 = R s . 0.60$