Cathodic Protection Tester Practice Exam

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What is the equivalent term for total opposition that a circuit presents to alternating current?

  1. Inductance

  2. Impedance

  3. Resistance

  4. Capacitance

The correct answer is: Impedance

The term that reflects the total opposition a circuit presents to alternating current is impedance. Impedance encompasses not only the resistance (which opposes the flow of direct current) but also includes reactance, which is the opposition to the flow of alternating current due to the circuit's inductance and capacitance. In alternating current circuits, both inductance and capacitance contribute to the overall opposition, affecting how the current behaves. While resistance measures the opposition to current flow directly related to energy loss, impedance captures the complex behavior of alternating currents explicitly, encompassing both resistive and reactive components. Hence, impedance is fundamental in analyzing how circuits respond to AC signals, making it the correct answer in this context.

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