Question

A primary coil has 360 turns, while secondary has 120 turns in a transformer. The output voltage is 220V. What is the input voltage, and what type of transformer is it

Answer 1

550V

Step - Down transformer

Step-by-step explanation:

Given parameters:

Number of turns in primary coil = 300 turns

Secondary turns = 120 turns

Output voltage = 220V

Unknown:

Input voltage = ?

Type of transformer = ?

Solution:

To solve this problem, we use the expression below:

`(V_(out) )/(V_(in) )` =
`(Ns)/(Np)`

So insert the parameters and find Vin;

`(220)/(Vin)` =
`(120)/(300)`

120Vin = 220 x 300

Vin =
`(220 x 300)/(120)` = 550V

Since the input voltage is greater than the output voltage, this is step - down transformer.