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# An electric generator coupled to a windmill produces an average electric power output of 15 kW. The power is used to charge a storage battery. Heat tr

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An electric generator coupled to a windmill produces an average electric power output of 15 kW. The power is used to charge a storage battery. Heat transfer from the battery to the surroundings occurs at a constant rate of 1.8 kW. Determine, for 8 hours of operation:
A) the total amount of energy stored in the battery, ink J
B) the value of the stored energy, in $, if electricity isvalued at$0.08 per $$\displaystyle{k}{W}\cdot{h}$$

Stored energy in battery, $$\displaystyle{E}_{{{s}{t}}}={15}-{1.8}={13.2}{k}{W}$$
In $$\displaystyle{k}{W}\cdot{h},{E}_{{{s}{t}}}={13.2}\times{8}={105.6}{k}{W}\cdot{h}$$
But $$\displaystyle{1}{k}{W}\cdot{h}={3.6}\times{10}^{{3}}{k}{J}$$
$$\displaystyle{E}_{{{s}{t}}}={\left({105.6}\times{3.6}\times{10}^{{3}}\right)}{k}{J}$$
The value of the stored energy = $$\displaystyle{\left({105.6}\times{0.08}\right)}\$$