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What is transformer ? Write its principle and write its construction. |
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Answer» Solution :Transformer is a device which can incrase or DECREASE the AC VOLTAGE. The transformer whichincrease the voltage are called step-up transformers, while transformers which decreases the voltage are called step-down transformers. Principle `:` Transformer works on the principle of the electromagnetic induction. Construction `:` A transformer consists of two sets of COILS insulated from each other. As shown in figure ( a+b) , the coils are wound on a sof -iron core either ONE on top of the other or on separate limbs of the core. One of the coils called the primary coil has `N_(p)` turns . The other coil is called the secondary coil has `N_(s)` turns. The primary coils is the input coil the secondary coil is OUTPUT coil of the transformer. The coils are wounded by two ways `:` (1)Core type`:` Coils are wound on a soft iron core on separate limbs of core as in figure . (2) Shell type `:` Coils are wound on a soft ironcore, either one on top of the other as in figure. 
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