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Using electricity

Electricity is supplied to consumers through the National Grid at a very high
voltage to reduce energy losses during transmission. Transformers are used to
increase or decrease the voltage of the supply. Electricity is charged in units. One
unit is equivalent to one kilowatt of electricity used for…

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The higher the current, the more heat is lost. To reduce these losses, the National Grid
transmits electricity at a low current. This needs a high voltage.

Power stations produce electricity at 25,000V. Electricity is sent through the National Grid
cables at 400,000V, 275,000V and 132,000V.

Step-up transformers are used…

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