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3.3 Function of a Capacitor

Among the many applications of a capacitor, it is used in electronic circuits to remove DC current from an electrical signal, or to store voltage for later release. The relationship between charge, the capacity of a capacitor and the applied voltage are closely bound (Fig. 3.7).

A simple circuit diagram showing a capacitor connected to a voltage source. The voltage source is labeled "V" and the capacitor is labeled "C" with the unit "Farad." The equation <span class= $Q = C V$ is displayed, representing the relationship between charge (Q), capacitance (C), and voltage (V).">

Fig. 3.7 Capacitor charge, and voltage.

练习题

A capacitor with a capacitance of $10 μ F$ is connected to a $12 V$ voltage source. What is the charge stored on the capacitor?

120 μ C

1.2 μ C

8.33 μ C

1200 μ C

Which of the following is NOT a typical application of a capacitor in electronic circuits?

A. Removing DC current from an electrical signal

B. Storing voltage for later release

C. Converting AC to DC

D. Energy storage in electronic circuits

In the capacitor charge equation $Q = C V$ , what does the variable $C$ represent?

A. The charge stored on the capacitor

B. The voltage applied across the capacitor

C. The capacitance measured in Farads

D. The current flowing through the capacitor

Which of the following statements about capacitors are correct?

A. Capacitors can remove DC current from electrical signals

B. Capacitors can store voltage for later release

C. The charge stored is proportional to the applied voltage

D. Capacitors are measured in Ohms

A capacitor can be used in electronic circuits to remove DC current from an electrical signal.

According to the equation $Q = C V$ , if the voltage across a capacitor doubles, the stored charge will be reduced by half.

Capacitors store voltage for later release in electronic circuits.

The fundamental equation relating charge, capacitance, and voltage for a capacitor is ___.

Describe two main applications of capacitors in electronic circuits based on the textbook content.

A motor is an example of an electric receiver that can contain capacitors among its components. Based on your knowledge of capacitors, explain how the capacitor's ability to store voltage might be useful in a motor circuit.

A capacitor with capacitance $C = 100 μ F$ is connected to a voltage source of $V = 12 V$ . Based on the relationship $Q = C V$ and the capacitor's fundamental ability to store electrical charge, what is the amount of charge stored in the capacitor?

Q = 1.2 μ C

Q = 1.2 m C

Q = 8.33 m C

Q = 1200 C

A capacitor can be used to remove DC current from an electrical signal because, when placed in a circuit with a direct current source, it exhibits different behavior than resistors and eventually blocks the flow of DC current after becoming fully charged.

According to the capacitor charge equation $Q = C V$ , if a capacitor with fixed capacitance $C$ stores charge $Q$ when voltage $V$ is applied, then doubling the applied voltage will ___ the stored charge.

A motor is an example of an electric receiver that contains capacitors among its components. Briefly explain how a capacitor's ability to 'store voltage for later release' could be beneficial in a motor circuit.

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3.3 Function of a Capacitor