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How long will the cassette tape player operate at normal power?

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A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit. The four alkaline battery cells store a total of 200 watts-second of energy. The cassette player is drawing a constant 10ma from the battery pack.

How long will the cassette tape player operate at normal power?

a) 8.3 x 10**2 sec
b) 3.3 x 10**3 sec
c) 13.3 x 10**3 sec
d) 26.6 x 10**3 sec

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Solution Summary

total time = energy/power

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