An electrical device changes the voltage of an electrical supply from 240 V a.c

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

An electrical device changes the voltage of an electrical supply from 240 V a.c. to 20 V a.c. What is this device? (A) a generator (B) a relay (C) a transformer (D) a voltmeter

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