Step-up transformer  - the secondary potential difference is larger than primary potential difference , Mutual inductance  - an EMF in and current are produced in one coil due to changing current in the other coil , Transformer - is a device that increases or decreases potential difference with relatively little waste of energy , Ideal transformer - The power delivered to the secondary circuit equals the power supplied to primary circuit  (100% efficient), Real transformer  - The efficiency is 95%- 98% ,

Transformers

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