What is the electrical property measured in ohms that opposes current flow?

Resistance is the electrical property measured in ohms that opposes the flow of electric current in a conductor. It quantifies how much the material resists the movement of charged particles within it, which is fundamental in determining how much current will flow given a particular voltage according to Ohm's Law (V = IR, where V is voltage, I is current, and R is resistance).

Resistance is intrinsic to the material and is influenced by factors such as temperature, length, and cross-sectional area of the conductor. It is a key concept in both direct current (DC) and alternating current (AC) circuits, making it essential for understanding and designing electrical and electronic systems.

Other options refer to different electrical properties. For example, reactance is the opposition to alternating current caused by capacitors and inductors, and it depends on frequency. Impedance is a broader concept that includes both resistance and reactance, representing the total opposition to AC. Capacitance, on the other hand, is a measure of a capacitor's ability to store charge, which is an entirely different property unrelated to the direct opposition of current flow as resistance does.