Which electrical property restricts the flow of current in a circuit?

Which electrical property restricts the flow of current in a circuit?

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

Answer: (A)

The main idea is how current flow is limited by a circuit element. Resistance is the property that restricts current. According to Ohm’s law, current equals voltage divided by resistance. For a fixed voltage, increasing resistance lowers the current, while decreasing resistance raises it. Resistance arises from the material’s resistivity and the geometry of the conductor (length and cross-sectional area), and it can increase with temperature. That’s why a long, thin wire or a material with high resistivity will limit current more than a short, thick conductor. Inductance, on the other hand, resists changes in current by generating a back‑EMF when current changes. Capacitance resists changes in voltage by storing charge. Impedance is the overall opposition to current in AC circuits, combining resistance with the effects of inductance and capacitance and depending on frequency. In a simple steady‑state DC situation, the direct restriction on current is provided by resistance.

The main idea is how current flow is limited by a circuit element. Resistance is the property that restricts current. According to Ohm’s law, current equals voltage divided by resistance. For a fixed voltage, increasing resistance lowers the current, while decreasing resistance raises it. Resistance arises from the material’s resistivity and the geometry of the conductor (length and cross-sectional area), and it can increase with temperature. That’s why a long, thin wire or a material with high resistivity will limit current more than a short, thick conductor.

Inductance, on the other hand, resists changes in current by generating a back‑EMF when current changes. Capacitance resists changes in voltage by storing charge. Impedance is the overall opposition to current in AC circuits, combining resistance with the effects of inductance and capacitance and depending on frequency. In a simple steady‑state DC situation, the direct restriction on current is provided by resistance.