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A step-down transformer is connected to ...

A step-down transformer is connected to `2400` volts line and `80` amperes of current is found to flow in output load. The ratio of the turns in primary and secondary coil is `20:1.` if transformer efficiency is `100%`, then the current flowing in primary coil will be

A

`1600A`

B

`20A`

C

`4A`

D

`1.5A`

Text Solution

Verified by Experts

The correct Answer is:
C
`(N_(s))/(N_(p))=(V_(s))/(V_(p)implies(1)/(20)=(V_(s))/(2400)impliesV_(s)=120V`
For `100%` efficiency `V_(s)i_(s)=V_(p)i_(p)`
`implies120xx80=2400i_(p)impliesip=4A`
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