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yoamocuy
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Homework Statement
A single phase 500V/250V transformer that supplies a rated load current of 10 A with a power factor of 0.8 lagging. At no load, the supplied current is 0.25 A with a power factor of 0.10 lagging. I am supposed to find the full-load primary current and express it in polar form. Winding impedance voltage drop can be neglected.
Homework Equations
I=Io + I2'
I2'=(N2/N1)*I2
V2/V1=N2/N1
The Attempt at a Solution
Full Load
500V/250V=N1/N2
I think that rated load current is = to I2
therefore, I2'=(250/500)*10 A
I2'=5 A
No Load
Io=0.25 A
using the equation I=Io + I2'
I= 5 A + 0.25 A
I=5.25 A
The correct answer is supposed to be 5.17 A at an angle of -38.9o