A solar cell provides an emf of 0.45 V. (a) If the cell supplies a constant current

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A solar cell provides an emf of 0.45 V. 

(a) If the cell supplies a constant current of 18.0 mA for 9.0 h, how much electric energy does it supply? 

(b) What is the power—the rate at which it supplies electric energy?

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