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Ohm's Law

Why and how v...

Question

Why and how voltage is very high and current is very low in power transmission lines

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Solution

In electric power transmission the voltage is stepped up to reduce the loss of electric energy due to Joule heating of the transmission wire.
Since, electric power,
P = VI.
So, the current will be smaller if the voltage is increased.

Energy dissipated as heat = i²Rt
Thus, low current transmission lowers the energy dissipated due to joule heating.

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