4 results found for 11-14-year-olds

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Hammack photocopier 00:04:00

Photocopier

by Bill Hammack
Photocopier
for 11-14 and upwards,
Lectures | 11-14 and upwards | 8 years ago | 3520 views
Rating:

Bill uses power tools to take apart a photocopier. He shows how it works, and shares the story of its invention by Chester Carlson.

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Hammack cellphone 00:03:00

The Cell Phone

by Bill Hammack
The Cell Phone
for 11-14 and upwards,
Lectures | 11-14 and upwards | 8 years ago | 913 views
Rating:

Bill invades a cell phone store to show that the design of a mobile isn't arbritary. Engineers uses seven basic principles to create a useful phone.

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Hammack transistor 00:03:00

The Transistor

by Bill Hammack
The Transistor
for 11-14 and upwards,
Lectures | 11-14 and upwards | 8 years ago | 817 views
Rating:

Bill examines the first transistor ever built. He explains how it works, and its impact on our world today. And, also, he even tests it out!

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Hammack tansistor 2 00:05:00

The Transistor 2

by Bill Hammack
The Transistor 2
for 11-14 and upwards,
Lectures | 11-14 and upwards | 8 years ago | 804 views
Rating:

Bill shows how a transistor works by examing a replica of the first one ever build: The Bardeen-Brattain point contact transistor.

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