# Power transferred in a transformer

Power absorbed from the voltage source in a circuit is $$=V_{rms} \ i_{rms} \ \cos(\phi)$$ where $$\phi$$ is the phase factor.

So in the primary circuit power absorbed from the voltage source is$$=V_{rms} \ i_{rms} \ \cos\left(-\frac{\pi}{2}\right)=0$$

So if the power absorbed from the voltage source is $$0$$ so then how can power be transformed to the secondary circuit?

• why do you think that $\phi = -\pi/2$? Apr 9 at 13:30