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  • The cost of 5 Rs/KWh of operating an electric motor for 9 hours takes 8 amp at 115 v is.Option: 1 30 Rs<div class='qna-option

The cost of 5 Rs/KWh of operating an electric motor for 9 hours takes 8 amp at 115 v is.

Option: 1

30 Rs


Option: 2

41 Rs


Option: 3

32 Rs


Option: 4

36 Rs


Answers (1)

best_answer


\text { 1 watt }=1 \mathrm{~J} / \mathrm{sec} \\
1 \mathrm{KWh}=\frac{V \times I \times t}{1000} \text { (in~hr) } \\
\text { Total KWh } =10^{-3} \times 115 \times 9 \times 8 \\
=8.28
\text { Total Cost }=8.28 \times 5 \\
=41.4 \text { Ruppees }
 

Posted by

Gautam harsolia

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