Yefim S. answered 02/21/23
Math Tutor with Experience
(a) P = I·U = 5.5A·120V = 660 W;
(b) W = P·t = 660W·20·60s = 792000 J
(c) Cost C = 792/3600kW·h·$0.020/kW·h = $0.0044
Charlotte A.
asked 02/21/23(a) What is the power rating of this iron?
(b) How many joules of energy are produced in 20.0 min?
(c) How much does it cost to run the iron for 20.0 min at $0.020/kW·h?
Yefim S. answered 02/21/23
Math Tutor with Experience
(a) P = I·U = 5.5A·120V = 660 W;
(b) W = P·t = 660W·20·60s = 792000 J
(c) Cost C = 792/3600kW·h·$0.020/kW·h = $0.0044
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