Unit 7, Chapter 24. CPO Science Foundations of Physics. Unit 7: Electricity and Magnetism. Chapter 24 Electricity and Magnetism. 24.1 Semiconductors 24.2 Circuits with Diodes and Transistors 24.3 Digital Electronics. Chapter 24 Objectives.
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Foundations of Physics
Chapter 24 Electricity and Magnetism
You can think of the bias voltage as the amount of energy difference it takes to open the diode.24.1 Diodes
A transistor is very sensitive; ten-millionths of an amp makes a big difference in the resistance between the collector and emitter.24.1 Transistors
As a result, the depletion region gets smaller.
Once the depletion region is gone, electrons are free to carry current across the junction and the semiconductor becomes a conductor.24.1 The physics of diodes
An npntransistor has a p-type layer sandwiched between two n-type layers.
A pnptransistor is the inverse.
An n-type semiconductor is between two layers of p-type.24.1 The physics of transistors
This version of the full-wave rectifier circuit is in nearly every AC adapter you have ever used.24.2 AC into DC
Transistors work very well for this application because they behave like switches that can be turned on and off electronicallyinstead of using manual or mechanical action.24.2 A transistor switch
When a tiny current flows into the base, the resistance drops to 10 ohms or less.24.2 A transistor switch
In electronics, the word “amplify” means to make the voltage or current of the input signal larger without changing the shape of the signal.24.2 A transistor amplifier
Instead, the transistor operates partially on and its resistance varies between a few hundred ohms and about 10,000 ohms, depending on the specific transistor.24.2 A transistor amplifier
All computers have three key systems:
central processing unit, or cpu
input-output system or I/O24.3 Computers
The fundamental logic gates are called AND, OR, NAND,and NOR.24.3 Computers
As their names imply, these gates compare two input voltages and produce an output voltage based on the inputs.24.3 Computers
The output of this circuit will be four ones (3V on each) only if the number entered by the keyboard exactly matches the number in the computer’s memory.24.3 Computers