Which circuit component is used to limit current flow?

Which circuit component is used to limit current flow?

• A. Switch
• B. Capacitor
• C. Conductor
• D. Resistor

Answer: (D)

Controlling how much current flows in a circuit is achieved by adding resistance. According to I = V/R, for a given voltage, increasing resistance lowers the current. A resistor provides a fixed resistance, so it can safely set the amount of current that reaches other components, like an LED. When you place a resistor in series with a load, the current through the whole circuit is determined by that resistor’s value; higher resistance means less current. A switch only opens or closes the circuit and doesn’t regulate current once the circuit is complete. A capacitor momentarily affects current while charging or discharging, but it doesn’t establish a steady, fixed current. A conductor mainly offers a low-resistance path and isn’t meant to limit current. So the component whose job is to limit current flow is the resistor.

Controlling how much current flows in a circuit is achieved by adding resistance. According to I = V/R, for a given voltage, increasing resistance lowers the current. A resistor provides a fixed resistance, so it can safely set the amount of current that reaches other components, like an LED. When you place a resistor in series with a load, the current through the whole circuit is determined by that resistor’s value; higher resistance means less current. A switch only opens or closes the circuit and doesn’t regulate current once the circuit is complete. A capacitor momentarily affects current while charging or discharging, but it doesn’t establish a steady, fixed current. A conductor mainly offers a low-resistance path and isn’t meant to limit current. So the component whose job is to limit current flow is the resistor.