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Question
A geyser has a label of \(2 \mathrm{~kW}-240 \mathrm{~V}\). What is the cost of using it for 30 minutes, if the cost of electricity is ₹ 3.00 per commercial unit?
Numerical
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Solution
Given: Power \(=2\ \mathrm{kW}\)
time \(=30\ \mathrm{min}=0.5\ \mathrm{h}\), and cost \(=₹3\) per unit.
Formula:
\[E=P\times t\]
\[E=2\times0.5=1\ \mathrm{kWh}\]
\[\text{Cost}=1\times₹3 \]
= ₹ 3.00
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