A resistor is a device used to introduce some amount of resistance into a circuit.

A resistor is a device used to introduce some amount of resistance into a circuit.

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

Answer: (A)

Resistance is the property that opposes the flow of electric current. A resistor is the component designed to provide a specific amount of that opposition, so it can set how much current flows for a given supply voltage. This is described by Ohm’s law, V = IR, which means for a fixed resistance the current changes in proportion to the voltage, and the resistor also converts some of that electrical energy into heat, helping to protect other components and control circuit behavior. The other parts have different roles: a battery is a source of electrical energy that provides the potential difference to drive current. A capacitor stores electric charge and affects how voltage changes over time, typically passing or blocking current depending on whether the circuit is AC or DC. An inductor stores energy in a magnetic field and resists changes in current, influencing how currents rise or fall rather than simply providing a fixed opposition.

Resistance is the property that opposes the flow of electric current. A resistor is the component designed to provide a specific amount of that opposition, so it can set how much current flows for a given supply voltage. This is described by Ohm’s law, V = IR, which means for a fixed resistance the current changes in proportion to the voltage, and the resistor also converts some of that electrical energy into heat, helping to protect other components and control circuit behavior.

The other parts have different roles: a battery is a source of electrical energy that provides the potential difference to drive current. A capacitor stores electric charge and affects how voltage changes over time, typically passing or blocking current depending on whether the circuit is AC or DC. An inductor stores energy in a magnetic field and resists changes in current, influencing how currents rise or fall rather than simply providing a fixed opposition.