What term describes opposition to the flow of electric current in a conductor?

What term describes opposition to the flow of electric current in a conductor?

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

Answer: (C)

Opposition to the flow of electric current in a conductor is called resistance. It tells you how much a material resists passing current, so for a given voltage, higher resistance means less current (V = IR). The unit is the ohm. Resistance depends on the material, its temperature, length, and cross-sectional area: longer, thinner, or hotter conductors have higher resistance. In HVAC work, resistance affects how much current a component will draw, how much voltage may drop along wiring, and how much heat a conductor may generate. A resistor shows how resistance can be used to control current, while the tiny inherent resistance of wires can cause voltage drop in long runs. Capacitance relates to storing charge and opposing voltage changes, inductance opposes changes in current due to magnetic fields, and conductance is the ease with which current flows (the reciprocal of resistance).

Opposition to the flow of electric current in a conductor is called resistance. It tells you how much a material resists passing current, so for a given voltage, higher resistance means less current (V = IR). The unit is the ohm. Resistance depends on the material, its temperature, length, and cross-sectional area: longer, thinner, or hotter conductors have higher resistance. In HVAC work, resistance affects how much current a component will draw, how much voltage may drop along wiring, and how much heat a conductor may generate. A resistor shows how resistance can be used to control current, while the tiny inherent resistance of wires can cause voltage drop in long runs. Capacitance relates to storing charge and opposing voltage changes, inductance opposes changes in current due to magnetic fields, and conductance is the ease with which current flows (the reciprocal of resistance).