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Difficulty: EasyCapacitors

Which of the following statements correctly identifies the primary function and operating principle of a capacitor in an electronic circuit?

  1. A
    It stores energy in a magnetic field to oppose sudden changes in electrical current.
  2. B
    It converts alternating current into direct current by permitting electron flow in only one direction.
  3. It stores electrical energy in an electrostatic field and opposes sudden changes in voltage.Answer
  4. D
    It allows continuous direct current flow across its internal dielectric layer to dissipate energy as heat.

Answer

It stores electrical energy in an electrostatic field and opposes sudden changes in voltage.
A capacitor is designed with two conductive plates separated by an insulating dielectric material. When a voltage is applied, opposite charges accumulate on the plates, establishing an electrostatic field that stores electrical energy. Because charge accumulation requires finite time, a capacitor naturally opposes any sudden change in voltage across its terminals.

Step-by-Step Solution

1
Identify the fundamental physical construction and energy storage mechanism of a capacitor.
A capacitor consists of two conducting plates separated by an insulating dielectric, which accumulates opposite charges to establish an electrostatic field.
Capacitors store potential electrical energy in an electrostatic field rather than a magnetic field.
2
Determine how a capacitor interacts with circuit voltage and current over time.
Because electrical charge requires finite time to build up or dissipate across the plates (q=C⋅Vq = C \cdot V), the component naturally resists instantaneous changes in voltage.
This property makes capacitors essential for filtering voltage ripples in power supplies and setting time constants in electronic circuits.

Key Concept

Capacitor Energy Storage and Voltage Regulation
Estimated Time:45s
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Topics

Capacitors

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