# NEET Physics Alternating Current Questions Solved

BOARD

With the help of a diagram, explain the priciple of a device which changes a low voltage into a high voltage but does not violate the law of conservation of energy. Give any one reason why the device may not be 100% efficient.

Device : Transformer                                         (1/2) marks

Diagram on page number 260 NCERT part           (1) marks

Principal: statement of mutual induction              (1) marks

Efficiency : Assuming no energy losses, the transformer is 100% efficienty i.e. ${I}_{p}{V}_{p}={I}_{s}{V}_{s}$

Difficulty Level:

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