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(i) Draw a labelled diagram of a step-do...

`(i)` Draw a labelled diagram of a step-down transformer. State the principle of its working.
`(ii)` Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer.
`(iii)` How much current is drawn by the primary of a transformer connected to `220V` supply when it delivers power to a `110V-550W` refrigerator ?

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