Which component is used to limit current flow in an electrical circuit?

Which component is used to limit current flow in an electrical circuit?

• A. Inductor
• B. Resistor
• C. Capacitor
• D. Diode

Answer: (B)

Current in a circuit is governed by Ohm’s law: I = V/R. A resistor provides a defined opposition to that current, so choosing its resistance value sets how much current will flow for a given supply voltage. This makes resistors ideal for limiting current and protecting other components by keeping currents within safe levels. Inductors resist changes in current and are used for filtering or energy storage rather than steady current limiting. Capacitors pass DC only during transient charging and then block it, so their limiting effect is temporary, not a steady current control. Diodes control the direction of current and introduce a forward voltage drop, but they don’t establish a fixed current limit by themselves. Therefore, the component best suited to limit current flow in a circuit is the resistor.

Current in a circuit is governed by Ohm’s law: I = V/R. A resistor provides a defined opposition to that current, so choosing its resistance value sets how much current will flow for a given supply voltage. This makes resistors ideal for limiting current and protecting other components by keeping currents within safe levels. Inductors resist changes in current and are used for filtering or energy storage rather than steady current limiting. Capacitors pass DC only during transient charging and then block it, so their limiting effect is temporary, not a steady current control. Diodes control the direction of current and introduce a forward voltage drop, but they don’t establish a fixed current limit by themselves. Therefore, the component best suited to limit current flow in a circuit is the resistor.