7. Electricity:Thomas Alva Edison
•Electric current
• D/C- Direct Current
• A/C- Alternating Current
• George Westinghouse
•Menlo
Park Laboratory
• Phonograph
• Light bulb
• First motion picture
cameras
•General
Electric Co.
8. Communications:Alexander Graham Bell
•Inventor
the deaf”
and “teacher of
• Wanted to find ways to
help deaf people
• Sound transmission
• Simultaneous telegraphs
•Bell
Telephone Co.
• In time, it became
• American Telephone and
Telegraph Co. (AT&T)