10 electric lamp of 100 watt is used for 5hours per day calculate the units of
energy
consumed by lamp in oneday
a.15units
b.20units
c.5unit
d.10unit
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Given:-
• Number of lamps=10
• Power of 1 lamp=100 watt
• Time for which each lamp used is one day=5 hrs
To find:-
• Energy consumed by lamp in one day
Solution:-
Power of 1 lamp=100 watt
Power of 10 lamp=100×10 watt=1000 watt
Time for which 1 lamp used=5 hrs
Total time for which 10 lamp used=5×10hr=50 hrs
Now we are applying formula for power:
⇒ E=P×t
Here:-
• P=power
• E=Energy
• t=time
Now substituting given values in formula:
⇒ E=1000 watt×50hrs
⇒ Energy=50000 Watt.hr
Now we have to convert it into standard unit or kilowatt hr, so we will divide it by 1000.
⇒ Energy=50000 ÷1000 KiloWatt.hr
⇒ Energy=50 KiloWatt.hr
• 1 kilowatt hr=1 unit
• 50 kilowatt hr=50 units
∴ So the required energy consumption is 50 units.
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