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Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?

A.	Transformer	B.	Transponder
C.	Transducer	D.	Converter

Answer and Explanation

Answer:Transformer

Explanation:
The transformer is used to transform a medium voltage supply to a low voltage supply, e.g. from 11 000 V to 400 V. A transformer is rated in kVA, kilo-Volt-Amps, which is a measurement of electrical power.

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