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Difficulty: EasyCapacitors

A circuit requires a component that can store electrical energy in an electrostatic field and block direct current (DC) while permitting alternating current (AC) to pass. Which electronic component should be used?

  1. A
    Inductor
  2. CapacitorAnswer
  3. C
    Resistor
  4. D
    Diode

Answer

Capacitor
A capacitor is constructed of two conductive plates separated by an insulating dielectric material. When voltage is applied, electrical charge accumulates on the plates, creating an electrostatic field that stores energy. Because the dielectric prevents electrons from crossing directly between the plates, steady direct current is blocked. However, alternating current continuously charges and discharges the plates with alternating polarity, effectively allowing AC signals to pass.

Step-by-Step Solution

1
Identify the energy storage mechanism described in the circuit requirement.
Energy is stored in an electrostatic field created by separated opposite charges on conductive plates.
Capacitors store potential energy in an electric field across a dielectric, whereas inductors store energy in a magnetic field.
2
Evaluate the component behavior with DC and AC signals.
The insulating dielectric layer stops direct current once the plates are charged, while continuous alternating voltage polarity allows alternating current to pass through capacitive action.
This fundamental characteristic makes capacitors standard for DC blocking and AC coupling applications.

Key Concept

Capacitor electrostatic energy storage and DC blocking/AC passing characteristics
Estimated Time:45s
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Topics

Capacitors

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