Alternating Current
Transformers
It is a device which can change a low voltage of high current into a high voltage of
low current and vice- versa. Its working is based on “mutual induction”.
There are two types of transformers.
Step-up transformer: It converts a low voltage of high current into a high voltage of low current.
NS > NP, ES > EP and IP > IS
Step-down transformer: It converts a high voltage of low current into a low voltage of high current.
NP > NS, EP > ES and IP < Is
View the Topic in this video From 01:16 To 58:27
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Transformation ratio,
K = \frac{N_{S}}{N_{P}} = \frac{E_{S}}{E_{P}} = \frac{I_{P}}{I_{S}}