Question

A transformer is to be used to provide power for a computer disk drive that needs 5.2 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 410, and it delivers 500 mA (the secondary current) at an output voltage of 5.2 V (rms). (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns?

Answer 1

Answer:

Fewer turns

Explanation:

The secondary voltage is given as 5.2 V and the voltage from the wall outlet that is primary voltage is 120 V

We have also given number of turns in primary is 410

We know the equation for transformer $\frac{V_1}{V_2}=\frac{N_1}{N_2}$

$\frac{120}{5.2}=\frac{410}{N_2}$

$N_2=17.76$

As the number of turns can not be fraction so $N_2=18$ so transformer should fewer turns at secondary as compared to primary