A. lags behind the voltage by about 75°
B. leads the voltage by about 75°
C. lags behind the voltage by about 15°
D. leads the voltage by about 15°
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A. lags behind the voltage by about 75°
B. leads the voltage by about 75°
C. lags behind the voltage by about 15°
D. leads the voltage by about 15°
C. lags behind the voltage by about 15°
No-load current in a transformer is the current flowing through the transformer windings when it is not supplying any load. This current is known as the “exciting current,” and it is used to establish and maintain the magnetic field in the transformer.
The no-load current lags behind the voltage by about 15°, this is because the core of the transformer has some inductive reactance which causes the current to lag behind the voltage by a small angle known as the “core loss angle.”
A. lags behind the voltage by about 75°: This is not correct, the current lags behind the voltage by about 15 degrees.
B. leads the voltage by about 75°: This is not correct, the current lags behind the voltage by about 15 degrees.
D. leads the voltage by about 15: This is not correct, the current lags behind the voltage by about 15 degrees.
The correct answer is C. lags behind the voltage by about 15°