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A step down transformer has a turn ratio...

A step down transformer has a turn ratio of `20 : 1`. If 8 volt are developed across `0.4 Omega` secondary, then the primary current will be:

A

`1 A`

B

`2 A`

C

`4 A`

D

`0.5 A`

Text Solution

Verified by Experts

The correct Answer is:
A
`(n_p)/(n_s) = 20/1 = (V_p)/(V_s) = (I_s)/(I_p)`
`:. I_(s) = 8/(4//10) = 20 A :. I_(p)=I_(s) xx 1/20 = 1A`.
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