Chapter 21, Problem 28P

To determine

The current in the secondary coil.

Answer to Problem 28P

Solution:

Secondary current with respect to primary current is $0.21\text{ A}$.

Explanation of Solution

Given info:

Voltage in primary coil, $V_p=25\text{ V}$

Voltage in secondary coil, $V_s=\text{120 V}$

Formula used:

The voltage ratio formula $\frac{N_p}{N_s}=\frac{V_p}{V_s}$ …… (1)

The current ratio formula $\frac{I_s}{I_p}=\frac{N_p}{N_s}$ …… (2)

Relating equation (1)and (2)

$\frac{I_s}{I_p}=\frac{V_p}{V_s}$ …… (3)

Calculation:

Substituting values in equation (3)

$\frac{I_s}{I_p}=\frac{25}{120}$

$=0.21\text{ A}$