Question

Explain with the help of a diagram, the working of a step -down transformer.

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Answer 1

Answer:

If Ns > Np, then the transformer is said to be step-up transformer because the voltage is stepped up in the secondary coil. Power consumed in both the coils is the same as even if the voltage increases or current increases, their product at any instant remains the same.

Answer 2

PRINCIPLE: Mutual Induction

DIAGRAM: attached below

WORKING: When an alternating voltage is passed over the primary coil the resulting current produces an alternating magnetic field linked with the secondary and induces an emf in it. The value of this induced emf depends upon the number of turns.

THEORY:

               $ep = -Np\frac{d\phi}{dt} \\es = -Ns\frac{d\phi}{dt}\\\frac{es}{ep} = \frac{Ns}{Np} = r$