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Q.

An electric lamp consumes 2 units of electricity in 50 hours. Its power is


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a

100 watt

b

25 watt

c

40 watt

d

20 watt 

answer is C.

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Detailed Solution

The power of the electric lamp is 40 watt.
Given data:
Energy consumed, E = 2 units
⇒              = 2 kW h    (as 1 commercial unit = 1 kWh)
⇒   =2000 Wh 
Time, t = 50 h
So, the electrical energy is given by
E = P × t P= ET
Where P is power, E is energy, and t is time.
⇒P = 200050 ⇒P = 40 W  
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An electric lamp consumes 2 units of electricity in 50 hours. Its power is