Part A When the ac generator in the figure(Figure 1) operates at high frequency,
ID: 1452996 • Letter: P
Question
Part A
When the ac generator in the figure(Figure 1) operates at high frequency, is the rms current in the circuit greater than, less than, or the same as when the generator operates at low frequency?
Part B
Choose the best explanation from among the following:
Choose the best explanation from among the following:
More current flows at high frequency because in that limit the capacitor is like a short circuit and current has two parallel paths to flow through. Less current flows at high frequency because in that limit the capacitor is like an open circuit and current has only one path to flow through. The capacitor has no resistance, and therefore the resistance of the circuit is the same at all frequencies. As a result the current is the same at all frequencies.Explanation / Answer
A. Current in the circuit will be
irms = Vrms/Z
Z = sqrt(R^2 + XC^2)
XC = 1/wC
if frequency is high then XC will be low, which gives us that Z will be low and if Z will be low than irms will be high.
Greater than.
B. More current flows at high frequency because in that limit the capacitor is like a short circuit and current has two parallel paths to flow through.