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6 February, 14:25

A battery charger is connected to a dead battery and delivers a current of 8.9 A for 4.7 hours, keeping the voltage across the battery terminals at 12 V in the process. How much energy is delivered to the battery?

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Answers (2)
  1. 6 February, 14:27
    0
    1807.56 kJ

    Explanation:

    Parameters given:

    Current, I = 8.9A

    Time, t = 4.7hrs = 4.7 * 3600 = 16920 secs

    Voltage, V = 12V

    Electrical energy is given as:

    E = I*V*t

    Where I = Current

    V = Voltage/Potential differenxe

    t = time in seconds.

    E = 8.9 * 12 * 16920

    E = 1807056 J = 1807.056 kJ
  2. 6 February, 14:31
    0
    1807056 J

    Explanation:

    Energy: This can be defined as the ability or the capacity to do work. The S. I unit of energy is Joules (J).

    The expression for electric energy is given as,

    Using,

    E = VIt ... Equation 1

    Where E = Electric Energy, V = Voltage, I = current, t = time.

    Given: V = 12 V, I = 8.9 A, t = 4.7 hours = 4.7*3600 = 16920 s

    Substitute into equation 1

    E = 12 (8.9) (16920)

    E = 1807056 J.

    Hence the amount of energy delivered to the battery = 1807056 J
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