While exploring our radio cassette player, we decided to look more in depth into the circut board. Here are some of the specific elements we found and what they do:
Radio Antenna: Produces an elecric current
Disc Capacitor: Reduces RF (radio frequency) noise
Transistor: Amplifies, controls, and generates electrical signals
Capacitor: Stores electrical energy
Resisters: Reduces current flow, adjusts signal levels, divides voltages, terminates transmission lines
(Credit to Mr. Nauman for all of the information)