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State the principle of working of a tran...

State the principle of working of a transformer.
(b) Define efficiency of a transformer.
(c ) State any two factors that reduce the efficiency of a transformer.
(d) Calculate the current drawn by the primary of a `90%` efficient transformer which steps down 220 V to 22 V , if the output resistance is 440 `Omega`.

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### Step-by-Step Solution **(a) State the principle of working of a transformer.** A transformer operates on the principle of **mutual induction**. This principle states that a changing magnetic field in one coil induces an electromotive force (EMF) in a nearby coil. In a transformer, when an alternating current flows through the primary winding, it creates a changing magnetic field, which induces a voltage in the secondary winding. --- ...
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