Honors Physics help please
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Honors Physics help please

[From: ] [author: ] [Date: 11-05-05] [Hit: ]
calculate cost: Cost = E(5.5¢/kW-h) = (1.8 kW-h)(5.5¢/kW-h) = 9.......
Find the cost of operating an electric toaster for 3.0 hours if it draws 5.0 A from a 120 V outlet. Electric energy costs 5.5 cents/kW-h.

the answer is 10 cents but how do i get 10 cents?

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We want to find how much energy this electric toaster uses.

First, calculate power: P = IV = (5.0 A)(120 V) = 600 W
Then, calculate energy: E = Pt = (600 W)(3.0 h) = 1800 W-h = 1.8 kW-h
Finally, calculate cost: Cost = E(5.5¢/kW-h) = (1.8 kW-h)(5.5¢/kW-h) = 9.9¢ ≈ 10¢
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