Which term describes the property of an electrical conductor that opposes a change in current flow?

• A. Capacitance
• B. Inductance
• C. Resistance
• D. Impedance

Answer: (B)

The correct term that describes the property of an electrical conductor that opposes a change in current flow is inductance. Inductance is the ability of a conductor to induce electromotive force (EMF) in itself or in a nearby circuit due to a change in current flow. This effect is based on the principle of electromagnetic induction, where a varying current creates a varying magnetic field around the conductor. If there is a sudden change in current, it produces a back EMF that opposes this change, effectively resisting the alteration of current flow.

Understanding inductance is crucial in applications involving inductors and transformers, where controlling the rate of change of current is essential to manage energy storage and transfer efficiently. It plays a key role in AC circuits, where the interplay of inductance and capacitance affects the overall impedance and behavior of electrical signals.

The other terms mentioned are related but do not specifically describe the property in question. Capacitance is the ability of a component to store an electrical charge, whereas resistance measures how much a material opposes the flow of direct current. Impedance combines resistance and reactance (which includes the effects of both capacitance and inductance) in alternating current circuits.