Transformers
A transformer is an electrical device that changes the voltage of an AC supply. A transformer changes a high-voltage supply into a low-voltage one, or vice versa.
A transformer that increases the voltage is called a step-up transformer
A transformer that decreases the voltage is called a step-down transformer
Step-down transformers are used in mains adapters and rechargers for mobile phones and CD players.
The National Grid
When a current flows through a wire, some energy is lost as heat. The higher the current, the more heat is lost. The National Grid transmits electricity at a low current to reduce these losses. This requires a high voltage.
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