LED (Light-Emitting Diode), Resistor, and a Battery
Below is the circuit diagram for an LED (Light-Emitting Diode) circuit.
The circuit will light up an LED with the 9V battery.
LEDs are just tiny light bulbs that are used in electrical circuits.
Unlike ordinary incandescent bulbs, they don't have a filament that
will burn out, and they don't get especially hot unless too much current is applied.
They are illuminated solely by the movement of electrons in a semiconductor material, and they last
just as long as a standard transistor.