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Question
Calculate the electrical energy consumed when a bulb of 40 W is used for 12.5 hours everyday for 30 days.
Numerical
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Solution
Given: \(P=40\ \mathrm{W}=0.04\ \mathrm{kW}\)
daily use \(=12.5\ \mathrm{h}\), for 30 days.
Formula: \[E=Pt\]
\[=0.04\times12.5\times30\]
\[=15\ \mathrm{kWh}\]
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