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Q.

An electric bulb of 100 W works for 4 hours a day. Calculate the units of energy consumed in 15 days in kWh.
 


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a

6 units

b

0.6 units

c

60 units

d

600 units 

answer is A.

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Detailed Solution

An electric bulb of 100 W works for 4 hours a day. The units of energy consumed in 15 days in kWh is calculated as 6 units.
E = P × t
Where P is in kW and t is in hours
If P is in Watts, the relation would be changed to
⇒E=Pt1000
⇒  E =100 × 4 ×151000
⇒E =6 kWh
⇒E= 6 units  [as 1 unit = 1 kWh]
 
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