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posted by  tah on 7/24/2008 5:10:35 PM  |  status: Live  

Voltage in step down transformer

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Question Details:
A step-down transformer produces a voltage of 5.3 {\rm V} across the secondary coil when the voltage across the primary coil is 140 {\rm V}.
What voltage appears across the primary coil of this transformer if 140 {\rm V} is applied to the secondary coil?

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posted by Steve (retired) on 7/24/2008 5:17:31 PM  |  status: Live
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tah's comment:
"not the right answer"
Response Details:
Given Vs = 5.3V      Vp = 140V
We know the transformer ratio is  = 26.415
IN the second part the voltage across the secondary coil is 140V.
Now the formula is
                               
                                Vp = 369.81V
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