Chapter 25, Problem 81A

To determine

To calculate:.

Turns ratio of the step-down transformer.

Answer to Problem 81A

Turns ratio of the step-down transformer is $545:1$ .

Explanation of Solution

Given:

  $V_s=440$ V

  $V_p=240,000$ V

Formula Used:

  $\frac{N_s}{N_p}=\frac{V_s}{V_p}$

where,

  $V_S$ = effective potential difference of secondary coil

  $N_p$ = No of turns of primary coil

  $V_p$ = effective potential difference of primary coil

  $N_s$ = No of turns of secondary coil

Calculation:

For turns ratio of the step-down transformer,

Using the formula,

  $\frac{N_s}{N_p}=\frac{V_s}{V_p}$

Substituting the values in above formula,

  $=\frac{440}{240,000}$

  $=\frac{1}{545}$

That is $545:1$

Conclusion:

Henceturns ratio of the step-down transformer is $545:1$ .