Electric Current Basics

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Questions and Answers

What is the main characteristic of Direct Current (DC)?

  • The flow is directed by external forces.
  • The flow changes direction periodically.
  • The flow of charge always flows in the same direction. (correct)
  • The flow occurs in bursts.

What does frequency measure in terms of electric current?

  • The number of complete cycles of alternating current in one second. (correct)
  • The amount of current flowing in a circuit.
  • The maximum voltage in a circuit.
  • The resistance an electrical circuit provides.

What device is used to measure the flow of electric current?

  • Oscilloscope
  • Thermometer
  • Ammeter (correct)
  • Voltmeter

How does resistance affect electric current?

<p>It controls or regulates the flow of current. (D)</p> Signup and view all the answers

What is the unit of electric current?

<p>Ampere (B)</p> Signup and view all the answers

What is voltage in the context of electricity?

<p>The force that drives electrical current (A)</p> Signup and view all the answers

What does current refer to in electrical terms?

<p>The flow of electricity measured in amperes (B)</p> Signup and view all the answers

Which property restricts the flow of current in an electrical circuit?

<p>Resistance (C)</p> Signup and view all the answers

What defines a circuit in electricity?

<p>A closed loop that permits electrical charges to move (A)</p> Signup and view all the answers

Which of the following describes an insulator?

<p>A material that does not allow electrical charges to move easily (D)</p> Signup and view all the answers

Flashcards

Direct Current (DC)

The flow of electric charge always moves in the same direction.

Alternating Current (AC)

The flow of electric charge periodically changes direction.

Frequency

The number of complete cycles of alternating current that happen in one second.

Ammeter

A device that measures the flow of electric current.

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Resistance

The ability of a material to resist the flow of electric current.

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Voltage

The force that pushes electric current through a circuit.

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Current

The flow of electrical charges through a circuit.

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Circuit

A closed loop of conductors that allows electricity to flow.

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Conductor

A material that lets electricity flow easily through it.

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Study Notes

Electric Current

  • Current: The flow of electric charge.
  • Voltage: The potential difference that drives the electric current.
  • Resistance: A material's opposition to the flow of electric current.
  • Direct Current (DC): Electric current that flows in one direction.
  • Alternating Current (AC): Electric current that periodically reverses direction.
  • Frequency: The number of complete cycles performed by AC in one second. Measured in Hertz (Hz)
  • Ammeter: A device used to measure electric current.
  • Control: Resistance controls the electric current.
  • Flow: Electric current is the flow of electric charges.
  • Electric Current unit: The Ampere (A).

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