Atransformer has a turns ratio of 2.5: 1. the primary voltage is 208 v. the secondary current is 18 a. what is the primary current?

 The primary current  will be 7.2 A.

Explanation:

Given that

Transfer ratio ,TR

TR= 2.5 :1

N₁=Number of turns on the primary side of the transformer

N₂=Number of turns on the secondary side of the transformer

I₁=current on the primary side of the transformer

I₂=current on the secondary side of the transformer

We can say that

Given that secondary current = I₂

I₂=18 A

Now by putting the values we get

The primary current  will be 7.2 A.