SOLUTION: A transformer has a secondary voltage of 140 volts and a secondary current of 3.5 amps. If the primary current is 10 amps, what is the primary voltage? (In this case, the voltages

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Question 1182453: A transformer has a secondary voltage of 140 volts and a secondary current of 3.5 amps. If the primary current is 10 amps, what is the primary voltage? (In this case, the voltages and currents are inversely proportional.)
Found 2 solutions by ikleyn, mananth:
Answer by ikleyn(52800)   (Show Source): You can put this solution on YOUR website!
.
A transformer has a secondary voltage of 140 volts and a secondary current of 3.5 amps.
If the primary current is 10 amps, what is the primary voltage?
(In this case, the voltages and currents are inversely proportional.)
~~~~~~~~~~~~~~~ 

The basic formula from electricity is


     = 


using standard notations.


From the basic formula,


     = .


Now substitute the given data and calculate.

Happy calculations (!)



Answer by mananth(16946)   (Show Source): You can put this solution on YOUR website!
The general formula for voltage current and number of turns in a transformer is


where N is number of turns is the voltage
I is the current
p is primary coil
s secondary coil

Vp = 14 *3.5 =49 Volts

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