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How they work

Christopher White

on 4 January 2013

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Transcript of Electronics

How do they work? Record on your activities page:
Why might a manufacturer of an electric car choose a material that is a conductor? Why might he choose an insulator? Notes: Insulators and Conductors These materials work to direct electric curent to places where it can be used to power the cars motor. These cannot, however send electronic information around the car. Electric signals: Activity: Try Discover activity on page 810 and answer question. This simulates electronic signals by using Morse code to send a message rather than speaking Notes: Electric signals Changes in the strength of electric current are used to send information (much like changes in light or sound send information in Morse code)
There are two types:
Analog: A steady change
Digital: Varies in pulses or steps Activity: Create an analogy (something that compares the topic to an unrelated topic in order to explain) how information is conveyed in analog and digital signals Notes: Semiconductors These are materials that transfer electric charges better than insulators, but not as well as conductors.
They are used to send electric signals Notes: N-type Semiconductors These have an extra electron, so they have a negative charge. They want to give them away Notes: P-type Semiconductors These have a missing electron and therefore a positive charge. They want to gain an electron Notes: Uses in Technology Combined with one N and one P these make a "diode"
Diodes make sure current can only move in one direction Combined in patterns NPN or PNP these make a transistor. Transistors can up or amplify he current or act as a switch Activity: Predict how these could be used in technology to send signals! THAT'S IT!!! Write your summary...
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