What type of circuit develops a voltage drop?

• A. A Series Circuit
• B. B Alternating Circuits
• C. C All circuits dependent on the impedance of the circuit
• D. D Parallel Circuit

Answer: (C)

Voltage drop happens when current flows through impedance. In any part of a circuit that has resistance or reactance, Ohm’s law in the form V = I·Z tells us there will be a voltage drop across that element. The distribution of those drops depends on how the impedances are arranged, but the essential point is that impedance is what creates the drop. If a path had zero impedance (an ideal conductor), there would be essentially no voltage drop there. So circuits that rely on impedance will develop voltage drops across their components, whereas an ideal, purely conductors-only path would not.