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Question

A lamp of 100 W and a heater of 1 kW are in simultaneous use for 10 hrs. The units of electricity consumed according to the meter in the house are:

A
10
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B
9
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C
11
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D
1
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Solution

The correct option is C 11
One unit of electricity is 1 kwh.
For lamp, electrical energy consumed is,
EL=PLt
EL=100×10
EL=1 kWh
EL=1 unit
For heater, electrical energy consumed is,
EH=PHt
EH=1000×10
EH=10 kWh
EH=10 unit
Hence, total electrical energy consumed is:
E=EL+EH
E=(1+10) unit
E=11 unit

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