Question

A transformer operates from 240V ac supply to give an output of 8 V for ringing a door bell. If the primary coil
has 3000 turns then no. of turns in the secondary coil is:
b. 100
c. 50
d. 240
a. 1000​

Answer 1

Answer:

100

Explanation:

Its quite simple.

The basic principle is electro-magnetic induction.If we increase the number of turns in the secondary coil we get a higher voltage , if we decrease them then we get

lower voltage.

Formula is : input voltage/output voltage=no. of turns in primary coil/no.of turns in secondary coil.