Multiple choice general knowledge

What is impedance?

  1. The opposition to the flow of current in an AC circuit

  2. The electric charge stored by a capacitor

  3. The inverse of resistance

  4. The force of repulsion between two similar electric fields
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Impedance is the total opposition to the flow of alternating current in a circuit, comprising both resistance and reactance. It is measured in ohms and is represented by the symbol Z. Impedance extends the concept of resistance to AC circuits by including phase differences between voltage and current. Option B is incorrect because impedance is not about stored charge. Option C is wrong because impedance is not the inverse of resistance.

Keep practicing — related questions