Answer to Question #207821 in Electric Circuits for Benji

Question #207821

a man uses a 900w electric iron to press his cloth for an average of 4 hours a week for 5 weeks . if the cost of electrical energy is 30 kobo per unit , calculate the cost of energy for pressing


1
Expert's answer
2021-06-17T15:09:31-0400

The total amount of energy can be calculated as the product of the power and the time the iron worked.

So the energy will be 900W4h5=18000Wh=18kWh900\,\mathrm{W}\cdot 4\,\mathrm{h}\cdot5 = 18000\,\mathrm{W\cdot h} = 18\,\mathrm{kW h} .

Therefore, the cost will be 18kWh30k/kWh=540k.18\,\mathrm{kW h} \cdot 30\,\mathrm{k/kWh} = 540\,\mathrm{k}.

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