Transformer
The Illustrated Guide to Electrical Building Services, Third Edition (BG 32/2014), by David Bleicher & Peter Tse, published by BSRIA in 2014, suggests that: ‘Transformers convert electrical energy to either a higher or lower voltage. In their most basic form, they consist of two coils of wire wrapped round an iron core... There is no electrical connection between the primary and secondary coils, however the alternating current (AC) in the primary coil produces an alternating magnetic field in the core. This in turn induces an alternating current in the secondary coil.’
--BSRIA
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