What is the purpose of a resistor in a LED circuit?

The purpose of a resistor in an LED circuit is to limit the current flowing through the LED. LEDs are designed to operate at a certain current range, and if the current exceeds this range, it can lead to overheating and potentially damage the LED. By placing a resistor in series with the LED, it ensures that the current is restricted to a safe level, allowing the LED to function properly without experiencing failure.

This current-limiting function is essential because LEDs have low resistance when they are forward-biased (when they are conducting), and without a resistor, the current could increase rapidly, resulting in excessive heat generation. Thus, the correct answer emphasizes the importance of controlling current to maintain the longevity and performance of the LED.