What is the function of a resistor?

What is the function of a resistor?

• A. Stores energy in magnetic fields
• B. Limits current flow
• C. Stores electrical energy for later use
• D. Induces electromotive force

Answer: (B)

A resistor controls how much current can flow in a circuit by introducing a defined resistance. According to Ohm’s law, current equals voltage divided by resistance, so choosing a higher resistance reduces current for a given voltage. In doing so, it helps protect components and shape signals. A resistor also dissipates power as heat, converting part of the electrical energy into heat energy. It does not store energy like a capacitor or inductive coil, and it does not generate or induce electromotive force; those roles belong to energy storage devices or power sources. For example, with a 9-volt source and a 3-ohm resistor, the current is 3 amps, and the resistor dissipates 27 watts as heat.

A resistor controls how much current can flow in a circuit by introducing a defined resistance. According to Ohm’s law, current equals voltage divided by resistance, so choosing a higher resistance reduces current for a given voltage. In doing so, it helps protect components and shape signals. A resistor also dissipates power as heat, converting part of the electrical energy into heat energy. It does not store energy like a capacitor or inductive coil, and it does not generate or induce electromotive force; those roles belong to energy storage devices or power sources. For example, with a 9-volt source and a 3-ohm resistor, the current is 3 amps, and the resistor dissipates 27 watts as heat.