The battery charger for an MP3 player contains a step-down transformer with a turns ratio of 1:32, 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?

3.75 Volts

Explanation:

Data provided in the question:

ratio of turns of transformer, N₁ : N₂ = 1 : 323

Applied Voltage, V₁ = 120 volts

Now, from the transformer equation

we have

N₁/N₂ = E₂/E₁

where,

E₂ is the voltage in the secondary coil

now, on substituting the values in the above relation, we get

1/32 = E₂/120

or

E₂ = 3.75 volts

Hence, the provided by the secondary coil is 3.75 volts