If the number of turns in primary coil is 5000. To reduce the input voltage from 250 volt to 100 volt what should be the number of turns in secondary coil?
Answers
A transformer takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice versa. That is, step up or step down the voltage in a circuit. A step-up transformer turns low-voltage electricity into high-voltage electricity while dropping the current. A step-down transformer changes high-voltage electricity into low-voltage electricity.
If we change the number of turns in the coils we change the induced emf. This allows us to change (transform) the voltage from the primary to the secondary coil.
The Turns Rule is:
Ns/Np=Vs/Vp
Where,
Ns= number of turns on the secondary coil
Np= number of turns on the primary coil
Vs= voltage across the secondary coil
Vp= voltage across the primary coil
So if a number of turns on the secondary coil is more than on the primary coil, the output voltage will be higher than the input voltage. This is called a step up transformer.
Hence, The secondary voltage as per the given question can be obtained as follows:
Let the input voltage be 6V and the output voltage is x. Let 5000 be the number of turns of the secondary coil and 500 be the number of turns of the primary coil.
Ns/Np=Vs/Vp;
That is, 5000/500=x/6
x=
500
5000×6
=60V.
Therefore, the secondary voltage is 60 V.