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In an AC circuit, what does the impedance (Z) represent?

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Question: In an AC circuit, what does the impedance (Z) represent?

Options:

  1. Total opposition to current flow
  2. Only resistance
  3. Only reactance
  4. Voltage drop

Correct Answer: Total opposition to current flow

Solution: 

Impedance (Z) is the total opposition that a circuit offers to the flow of alternating current, combining both resistance and reactance.

In an AC circuit, what does the impedance (Z) represent?

Practice Questions

Q1
In an AC circuit, what does the impedance (Z) represent?
  1. Total opposition to current flow
  2. Only resistance
  3. Only reactance
  4. Voltage drop

Questions & Step-by-Step Solutions

In an AC circuit, what does the impedance (Z) represent?
Correct Answer: Impedance (Z) is the total opposition to AC.
  • Step 1: Understand that in an AC circuit, current changes direction periodically.
  • Step 2: Know that impedance (Z) is a measure of how much the circuit resists this changing current.
  • Step 3: Realize that impedance includes two parts: resistance (which opposes current flow) and reactance (which opposes changes in current due to capacitors and inductors).
  • Step 4: Remember that impedance is measured in ohms, just like resistance.
  • Impedance – Impedance (Z) represents the total opposition to alternating current, including both resistance (R) and reactance (X).
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