In electronics, what does the positive lead of a LED indicate?

The positive lead of a LED, known as the anode, indicates the supply voltage. LEDs are diodes that emit light when electrical current passes through them in the forward direction. For an LED to function properly, the anode must be connected to a higher voltage relative to the cathode, which is the negative lead. This connection allows current to flow through the LED, causing it to emit light.

Understanding this principle is crucial for circuit design, as incorrectly connecting the leads can result in the LED not lighting up or even being damaged. The other options do not accurately describe the role of the positive lead in the context of an LED's operation.