Question

Review. A rechargeable battery of mass 15.0 g delivers an average current of 18.0 mA to a portable DVD player at 1.60 V for 2.40 h before the battery must be recharged. The recharger maintains a potential difference of 2.30 V across the battery and delivers a charging current of 13.5 mA for 4.20h. (b) How much internal energy is produced in the battery during one charge-discharge cycle?

Answer 1

The internal energy produced in the battery during one charge-discharge cycle is 7.8 J.

What is the energy?

Energy is defined as the ability to do work. Now we can tell about the energy of the charge from the information provide;

Mass of the battery = 15.0 g

Current = 18.0 mA

Voltage =  1.60 V

Time (t1) =  2.40 h

Time (t2) = 4.2 h

Recall that internal energy = energy of the charge = 2.3 * 1.8 * 10^-2 * 4.2 * 60 = 7.8 J

Hence the internal energy produced in the battery during one charge-discharge cycle is 7.8 J.

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