Simple Description

A device that can be used to increase voltage (step up transformer) or decrease voltage (step down transformer)

Further Detail

Transformers are used in the National Grid to increase voltage before transmitting electricity through cables. This reduced the current and therefore reduces the heat loss. A step down transformer is then used to decrease the voltage to make it safe for our homes. The formula for calculating a change in voltage is:

Related Words:

• National grid
• Step up
• Step down

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