Module 4 Chapter 2 Electricity: Energy, Power and Resistance Flashcards

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1
Q

Why do electrical bills use kilowatt-hours rather than joules?

A

Because the amount of energy used in a typical household is so great that it would be silly to use units as small a joules. A kilowatt-hour is 3,600,000 times larger than a joule.

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2
Q

How do you calculate the cost of using a given amount of energy?

A

cost (£) = energy (J / kW h) * cost per unit of energy (£ J-1 / £ (kW h)-1)

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