The battery charger for an MP3 player contains a step-down transformer with a turns ratio of 1:26, so that the voltage of 120 V available at a wall socket can be used to charge the battery pack or operate the player. What voltage does the secondary coil of the transformer provide?

4.615 V

Explanation:

Using,

Ns/Np = Vs/Vp Equation 1

Where Ns/Np = Transformer ratio, Vs = Secondary voltage, Vp = Primary Voltage.

make vs the subject of the equation

Vs = Vp(Ns/Np) Equation 2

Given: Ns/Np = 1:26 = 1/26, Vp = 120 V.

substitute into equation 2

Vs = 120(1/26)

Vs = 120/26

Vs = 4.615 V.

Hence the secondary coil of the transformer provides a voltage of 4.615 V

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