The following graph shows the voltage and current through a single circuit eleme

Question

The following graph shows the voltage and current through a single circuit element. What is the frequency of the ac generator? VP = 65.0 V, IP = 4.60 A, t1 = 0.0641 s.

PART B The circuit element above is either a resistor, an inductor, or a capacitor. Use the graph and what you know of circuit elements to determine what type of element is shown in the graph. If it is a resistor, what is its resistance? If it is an inductor, what is its inductance? If it is a capacitor, what is its capacitance?

Explanation / Answer

1. From the graph, t1 = 1.25T
where T is time period of te generator
T = 0.05128
so f = 1/T = 19.5 Hz

2. The current is leading the voltage by a phase angle 90 deg, so V = Vmsin(wt), I = Imsin(wt+90). Hence when current leads, its a capacitor

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