Resistors resist the flow of electrons, causing the voltage to drop.
Relays are switches. If electrons are going through the relay coil, COM is connected to N.O. If electrons are not going through the coil, then COM is connected to N.C.
Transistors, if hooked up properly, can amplify the electrons. In another hookup, Transistors can be used as switches.
Diodes are like gates. The electrons can only flow from termianal A to terminal B, but not from terminal B to terminal A.
Integrated Circuits are tiny circuit boards. Before the invention of IC's, or microchips, computers took up whole rooms.
Meters measure a unit of electricity. Common units measured by meters are watts, volts, and amps.
Speakers turn electronic signals into sound waves which you can hear, as in a radio.
CdS Cells are components which change their resistance when the light changes. CdS stands for CaDmium Sulfide.
LED Digital Displays have seven tiny lights called segments. LED displays can display numbers and some letters.
Variable Resistors change their resistance when you turn a knob, instead of when the light changes.
LEDs are diodes that light up when electrons pass through them. Stands for Light Emitting Diode
Transformers change electricity into the proper kind for a speaker, or change AC to DC.
Tuning Capacitors, or Variable Capacitors, change their frequency when you turn the knob.
Antennas pick up TV or Radio waves and turn them into electricity.
Batteries supply power for the electronic components.