Question

Would a step-up transformer or a step-down transformer be used to convert 260 volt AC current from a household input into a 13 volt AC output in a portable electric fan? Determine the ratio of the number of input wire coils to output wire coils on the transformer.​

Answer 1

20:1

Explanation:

It is given that,

Input voltage = 260 volt

Output voltage = 13 volt

We need to find the ratio of the number of input wire coils to output wire coils on the transformer.​

For a step-down transformer,

`(V_i)/(V_o)=(N_P)/(N_S)\\\\(N_P)/(N_S)=(260)/(13)\\\\=(20)/(1)`

Hence, the required ratio is 20:1.