Transformers

~

e

(primary)

(secondary)

• AC voltages can be stepped up or stepped down by the use of transformers.

iron

• The AC current in the primary circuit creates a time-varying magnetic field in the iron

• The iron is used to maximize the mutual inductance. We assume that the entire flux produced by each turn of the primary is trapped in the iron.

V2

V1

• This induces an emf on the secondary windings due to the mutual inductance of the two sets of coils.

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