Question

A transformer with 1000 turns on the primary coil is used to decrease the voltage from 2500 V to 120 V for home use. How many turns should be in the secondary coil? A) 84 turns B) 48 turns C) 6.4 turns D) 5 turns E) 250 turns

Answer 1

The number of turns in the secondary coil is 48.

(B) is correct option.

Step-by-step explanation:

Given that,

Number of turns on primary coil= 1000

Primary voltage = 2500 V

Secondary voltage = 120 v

We need to calculate the turns in the secondary coil

Using relation between voltage and number of turns in primary and secondary coil

`(V_(s))/(V_(p))=(N_(s))/(N_(p))`

Put the value into the formula

`(120)/(2500)=(N_(s))/(1000)`

`N_(s)=(120)/(2500)*1000`

`N_(s)=48\ turns`

Hence, The number of turns in the secondary coil is 48.