Statement: A 3 kW boiler runs for 10 minutes. The rate of electricity is $0.15 per kilowatt-hour. How much it costs you for an hour?

Solution:

Step 1: Apply formula of energy: W = P.t

Step 2: Convert unit to kWh,

W = 3 kW* 10 minutes = 3 kW*10*(1/60) hours = 0.5 kWh

Step 3: Cost calculation

Now cost is $0.15 kWh, So cost = 0.5 kWh*$0.15/kWh

= $0.075

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