Capacitance Measurement Quiz

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Questions and Answers

What is the primary function of a capacitor?

  • To store energy in the form of sound waves.
  • To convert electrical energy into mechanical energy.
  • To regulate the temperature of electrical circuits.
  • To store electrical energy in the form of an electric field. (correct)

What are capacitors named after?

  • The type of current they can store.
  • The dielectric material used between the metal plates. (correct)
  • The voltage at which they operate efficiently.
  • The amount of charge they can hold.

What is a key difference between a capacitor and a battery?

  • A battery can only discharge energy but not charge.
  • A capacitor is designed for long-term energy storage.
  • A battery relies solely on insulating materials.
  • A capacitor can charge and discharge quickly. (correct)

What role does the insulating material play in a capacitor?

<p>It increases the capacitance of the capacitor. (A)</p> Signup and view all the answers

Which of the following statements about capacitors is incorrect?

<p>Capacitors store energy longer than batteries. (A)</p> Signup and view all the answers

What happens during the first half of an AC cycle in a capacitor?

<p>The capacitor is charged. (C)</p> Signup and view all the answers

What is the formula for capacitance in a capacitor?

<p>$C = rac{Q}{V}$ (D)</p> Signup and view all the answers

What characterizes the current intensity's decay in a discharging capacitor?

<p>It follows an exponential decay. (B)</p> Signup and view all the answers

What occurs when a capacitor is fully charged in a DC circuit?

<p>The capacitor prevents DC current from passing through. (C)</p> Signup and view all the answers

What does the time constant in a capacitor represent?

<p>The magnitude of $ rac{1}{RC}$. (C)</p> Signup and view all the answers

Flashcards

Capacitor function

A device that stores electrical energy in an electric field between two conductors separated by an insulator.

Capacitor structure

Two metal plates separated by an insulating material (dielectric).

Capacitor vs. battery

Capacitors store charge quickly; batteries provide a steady current over time.

Capacitor naming

Capacitors are named according to the insulating material used (dielectric).

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Insulator's effect

The insulating material (dielectric) increases the capacitor's ability to store charge.

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Capacitor AC operation

A capacitor allows alternating current to flow, charging and discharging during each half-cycle, reversing polarity with each cycle.

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Capacitor DC operation

Capacitors block direct current (DC) by storing charges on their plates. Once fully charged, no more current flows.

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Capacitor capacitance (C)

The amount of charge (Q) a capacitor stores when a potential difference (V) of 1 Volt is applied across its plates.

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Charging a Capacitor

The process where a capacitor accumulates charges on its plates, done via a circuit.

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Discharging a Capacitor

The process of removing stored charge from a capacitor through a circuit.

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Capacitor Charging/Discharging Equation

The current in a charging/discharging capacitor decays exponentially, described by the equation: I = Iâ‚€e^(-t/RC).

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RC time constant

The time it takes for the current in a charging/discharging capacitor to decrease to approximately 37% of its initial value in an RC circuit.

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Study Notes

Aim

  • Determine the capacitance of a capacitor using charging and discharging methods.

Capacitor

  • Two pieces of metal with an insulating material between them act as an energy storage device.
  • Stores electrical energy as an electric field.
  • Charges and discharges faster than a battery.
  • Classified according to the dielectric material used.
  • The insulating material affects the capacitor's capacitance, increasing it.

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