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13 October, 10:55

A certain battery has terminals labeled a and b. The battery voltage is vab = 12 V. a) To increase the chemical energy stored in the battery by 900J, how much charge must move through the battery? b) Should electrons move from a to b or from b to a?

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  1. 13 October, 11:05
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    (a) The charges of 75 C must flow through battery.

    (b) The electrons must flow from a to b.

    Explanation:

    (a)

    The relationship between the energy and voltage is as follows:

    Energy = (Voltage) (Current) (Time)

    but, (current) (time) = charge

    therefore,

    Energy = (Voltage) (Charge)

    Charge = (Energy) / (Voltage)

    Charge = (900 J) / (12 V)

    Charge = 75 C

    (b)

    Since, Vab = Va - Vb = 12 V

    Hence, the equation suggest that Va is at higher potential then Vb.

    As, the current flows from higher to lower potential.

    Thus, electrons must flow from a to b
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