Question

A 25 nF capacitor is connected across an AC generator that produces a peak voltage of 4.9 V.

What is the instantaneous value of the emf at the instant when iC=IC?

Answer 1

The current ic is expressed as follows ific = 1c , then the above equation becomes as follows: cos (1) This means that, at →_ when ic-1c . Thus, the instantaneous value of the emf is. cccos or From the above result, it is clear that the phase angle between current and voltage fora purely capacitive circuit seems to be 90 degrees, and then it appears the emf of an AGC voltage source equation can be utilized and cosine of 90 is 0. Therefore, the instantaneous value of the emf is zero when,一