Question

How is the emf across primary and secondary coils of a transformer related with the number of turns of coil in them?

Answer 1

Step 1: Definition of emf

Electromotive Force (emf) is the amount of energy delivered per unit of electric charge by a power source.

Step 2: Relation between number of turns and emf

The ratio of emf in the primary and secondary coil is given by: $\frac{E_s}{E_p}$

The ratio of emf to the number of turns of the coil is the same for both primary and secondary coils.

Mathematically it can be written as:

$\frac{E_s}{N_s}=\frac{E_p}{N_p}$

Where,

$E_s$ is emf across the secondary coil.

$N_s$ is the number of turns of the secondary coil.

$E_p$ is emf across the primary coil.

$N_p$ is the number of turns of the primary coil.

Step 3: Final answer

Thus the emf across primary and secondary coils of a transformer related with the number of turns of coil as:

$\frac{E_s}{N_s}=\frac{E_p}{N_p}$