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2 September, 16:21

5. An electrical power plant generates electricity with a current of 50 A and a potential difference of 20 000 V. In order to minimize the power losses due to the high current heating up the line, a transformer steps up the potential difference to 500 000 V before it is transmitted. What is the current in the transmission lines?

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  1. 2 September, 16:29
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    2A

    Explanation:

    A transformer operates on the principle of mutual inductance. That is, the flow of induced current or voltage in a coil due to an alternating or carrying current in a neighboring coil. For a transformer, we can write;

    Es/Ep = Ip/Is

    Where;

    Es = voltage in the secondary coil = 500,000V

    Ep = voltage in the primary coil = 20,000 V

    Is = current in the secondary coil = ?

    Ip = current in the primary coil = 50A

    Thus;

    Es*Is = Ep*Ip

    Is = Ep * Ip/Es

    Is = 20000 * 50/500000

    Is = 2A
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