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Question
Calculate the daily household electric bill for a family which uses the following appliances for 8 hours a day, when electrical energy costs ₹ 2 per unit. (i) one 100 W bulb (ii) one 100 W fan (iii) one 1000 W heater.
Numerical
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Solution
Given: Total power and daily usage are as follows:
\[P=100+100+1000\]
\[=1200\ \mathrm{W}\]
\[=1.2\ \mathrm{kW}\]
Formula:
\[E=P\times t\]
\[E=1.2\times 8=9.6\ \mathrm{kWh}\]
\[\text{Cost}=9.6\times ₹2=₹19.20\]
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