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12 April, 23:29

Pylon cables in the National Grid have some resistance. Power (watts) = Current2 (amperes) x Resistance (ohms) Looking at the power equation above, can you explain why transmitting electricity at a very high voltage is beneficial? Hint: Think about the equation Power (W) = P. D (V) x Current (A) Equation

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  1. 13 April, 00:29
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    Answer: To reduce resistance in order to achieve high efficiency of electrical transmission.

    Explanation: Given that the

    Power P = Current I^2 x Resistance R

    That is,

    P = I^2 * R

    Also, remember that

    P = IV

    Where V = voltage.

    Looking at the power equations above, we can explain why transmitting electricity at a very high voltage is beneficial. Because Transmitting at very high voltage will make current to be transmitted or flow through the wire with a very small magnitude. Since Voltage is inversely proportional to current from the formula

    P = IV

    Electricity will flow in any diameter of cable use with a low resistance thereby, increasing the efficiency of the electricity transmission by reducing the heat that might be generated as a result of electrical resistance during the course of transmission.
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