Question

The batteries in a portable CD player are recharged by a unit that plugs into a wall socket. Inside the unit a step-down transformer with a turns ratio of 2:27. The wall socket provides 120 V. What voltage does the secondary coil of the transformer provide?

Answer 1

Step-by-step explanation:

It is given that,

Turn ratio,
`(N_s)/(N_p)=(2)/(27)`

Where

`N_p` is the number of turns in primary coil

`N_p` is the number of turns in secondary coil.

Input voltage,
`V_i=120\ V`

We need to find the voltage provided by the secondary coil. The relation is as follows :

`(V_o)/(V_i)=(N_s)/(N_p)`

`(V_o)/(120)=(2)/(27)`

`V_o=8.89\ V`

So, the voltage provided by the secondary coil is 8.89 volts. Hence, this is the required solution.