Question
A household receives a $\$ 145$ electricity bill. The cost of electricity is$\$ 0.120 / \mathrm{k} \mathrm{W}$ h. How much energy, in joules, did the household use?
Step 1
We do this by dividing the total cost of the electricity bill by the cost per kilowatt hour. \[ \text{Energy used in kWh} = \frac{\text{Total cost}}{\text{Cost per kWh}} = \frac{\$145}{\$0.120/\text{kWh}} = 1208.33 \text{ kWh} \] Show more…
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