The document discusses electronics topics including semiconductors, signals, telephones, and sound recordings. It describes how semiconductors can conduct electricity under certain conditions and are used in diodes, transistors, and integrated circuits. It explains how telephones transmit sound as electronic signals that are converted to and from sound by the transmitter and receiver. It contrasts analog and digital signals and how analog recordings and digital recordings like CDs represent sound information differently.

1. Electronics Students will be able to Contrast different electronic signals Describe semiconductors Explain how phones transmit sound Describe how sounds are transmitted Page 106

5. Semiconductor Types 110

10. Telephones 115

14. AM vs FM 118

15. Radio 120

16. TV 121