Question

A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary?
A. 1,653
B. 690
C. 72
D. 8

Answer 1

There are numerous information's of immense importance already given in the question.
Primary voltage of the transformer (V1) = 115 V
Secondary voltage of the transformer (V2) = 24 V
Number of turns in the primary (T1) = 345
Let us assume the number of turns in the secondary = T2
Then
(V1/V2) = (T1/T2)
(115/24) = 345/T2
115T2 = 345 * 24
115 T2 = 8280
T2 = 8280/115
     = 72
So the correct option among all the options given in the question is option "C".

Answer 2

Answer:

The is 1653

Explanation:

Primary Voltage = # of turns in primary

Secondary Voltage  # of turns in secondary

115 V = 345

24 V     # of turns in secondary

115\25=4.79167

4.79167 = 345

               # of turns in secondary

4.79167 * 345 = 1653.12

When rounded 1653