What is impedance in an electrical circuit and how does it influence fault current in aircraft wiring?

• A. Impedance increases fault current and accelerates protection.
• B. Impedance combines resistance and reactance; higher impedance reduces fault current, affecting protection timing and voltage drop.
• C. Impedance is irrelevant to fault currents in aircraft wiring.
• D. Impedance is the same as resistance and does not include reactance.

Answer: (B)