Physics

Physics

Problem

An electric kettle is rated at 1.50×103 W1.50\times10^{3}\,\text{W} and is used to boil water for exactly 3.0 min3.0\,\text{min}. The local cost of electrical energy is \0.12perkilowatt⋅hour(kWh).Thehouseholdsupplyvoltageis0.12 per kilowatt·hour (kWh). The household supply voltage is 120\,\text{V}$ and may be treated as constant. (a) Calculate the total electrical energy consumed by the kettle during the 3.0 min3.0\,\text{min} interval. Express your answer in joules. (b) Convert the energy found in part (a) to kilowatt·hours and determine the cost of operating the kettle for this time. (c) Determine the electric current drawn by the kettle from the 120 V120\,\text{V} outlet during operation.

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