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Capacitors

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Question 7

An alternating potential difference square-wave is applied across a series circuit containing a capacitor of capacitance CCC and a resistor of resistance RRR. The period of the input signal is 80 ms80\text{ ms}80 ms.

a.

Calculate the frequency fff of the input square-wave signal.

[1]
b.

The graph shows the variation of the charge QQQ on the positive plate of the capacitor with time ttt.

Graph of Charge Q on the positive plate of a capacitor against time t

Create a calculation using the discharging section from t=40 mst = 40\text{ ms}t=40 ms to t=80 mst = 80\text{ ms}t=80 ms to determine the time constant of this circuit in ms\text{ms}ms.

[3]
c.

Calculate the maximum magnitude of the current in the resistor.

[2]

Capacitors Questions

  1. A Level
  2. /Physics
  3. /Capacitors