Question

A typical wall outlet voltage in the United States is 120 volts. Personal MP3 players require much smaller voltages, typically 292.2 mV . If the number of turns in the primary coil is 2464 , calculate the number of turns on the secondary coil of the adapter transformer.

Answer 1

Answer:

The secondary coil should have 6 turns

Step-by-step explanation:

Voltage Transformer

Voltage step-down transformers reduce the voltage of a higher voltage circuit to a lower voltage circuit for the load voltage requirements.

The turns ratio is the division of the number of turns in the primary coil Np by the number of turns in the secondary coil Ns by the equation

$\displaystyle TR = \frac{Np}{Ns}$

This ratio should also equal the voltage of the primary side Vp divided by the voltage of the secondary side Vs, as given by

$\displaystyle TR = \frac{Vp}{Vs}$

Thus, we have

$\displaystyle \frac{Np}{Ns}=\frac{Vp}{Vs}$

Solving for Ns

$\displaystyle Ns=\frac{NpVs}{Vp}$

$\displaystyle Ns=\frac{2464\cdot 0.2922}{120}=6$

The secondary coil should have 6 turns

Answer 2

The number of turns on the secondary coil of the adapter transformer is 6 turns.

What is a transformer?

A transformer is an electromagnetic device that can either step up or step down voltage or current.

Primary voltage / Secondary voltage = turn in primary / turn in secondary.

Hence:

120 / (292.2 * 10⁻³) =  2464  / secondary turn

Secondary turn = 6

The number of turns on the secondary coil of the adapter transformer is 6 turns.

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