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A step-down transformer is used on a 100...

A step-down transformer is used on a `1000 V` line to deliver `20A` at `120V` at the secondary coil. If the efficiency of the transformer is `80%` the current drawn from the line is.

A

3A

B

30A

C

0.3A

D

2.4A

Text Solution

Verified by Experts

The correct Answer is:
A
`eta =(V_SI_S)/(V_P I_P)`
`therefore 80/100 = (120 xx 20)/(1000 xx I_P)`
`I_P = 24/8 = 3A`
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