Question

The ratio between the primary voltage and the secondary voltage in a transformer is equal to:

• A. the ratio between the number of turns in the primary coil and the number of turns in the secondary coil.
• B. the ratio between the current in the primary coil and the current in the secondary coil.
• C. the ratio between the magnetic field in the primary coil and the magnetic field in the secondary coil.
• D. the ratio between the power in the primary coil and the power in the secondary.
• E. the inverse of the ratio between the number of loops in the primary coil and the number of loops in the secondary coil.

Answer 1

The correct option is A the ratio between the number of turns in the primary coil and the number of turns in the secondary coil.

Let number of turns in primary and secondary coils be $N_p$ and $N_s$ respectively.

Using $\frac{V_p}{N_p}=\frac{V_s}{N_s}$ $⟹\frac{V_p}{V_s}=\frac{N_p}{N_s}$