Question

the ratio of no. of turns of primary coil to secondary coil in a transformer is 2:3 . if a cell of 6V is connected across the primary coil,then the voltage across the secondary coil will be​

Answer 1

Answer:

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Explanation:

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 number of turns on the primary coil is more than on the secondary coil, the output voltage will be lesser than the input voltage. This is called a step down transformer.

In this case, the turns ratio is 5:4.

Np/Ns=Vp/Vs;

That is, 5/4 = 220/x.

x=

5

220×4

=176V. The ratio of the voltages is 5:4.

It is a known fact that voltage and current are inversely proportional and so the ratio of the primary current to the secondary current is 4:5.

Hence, the the ratio of the primary current to the secondary current is 4:5.

Answer 2

Given:

the ratio of no. of turns of primary coil to secondary coil in a transformer is 2:3

cell of 6V is connected across the primary coil

here

N1/N2=2:3

V1=6V

N2/N1=V2/V1

V2=V1×N2/N1

=6×3/2

=3×3

=9V

the voltage across the secondary coil will be​ 9V