ELECTRONICCOMPUTER AGE - PowerPoint PPT Presentation
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ELECTRONICCOMPUTER AGE
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Electronic Components & Circuits. Electronic components or parts ... Schematics --- drawings that show plans for circuits ... Electronic Components & Circuits ... – PowerPoint PPT presentation
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Title: ELECTRONICCOMPUTER AGE
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ELECTRONIC/COMPUTERAGE
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Electronic/Computer Age
- Electronics
- Electrical signals can carry information quickly
over wires or through the air by radio - Light, Appliances and Entertainment
- Atoms
- An atom is the tiniest part of a material
- There are only 109 elements known to exist
- Compounds --- different kinds of atoms combined
together, e.g. table salt, water etc - A compound has properties all its own
- Atoms are made of smaller particles with their
own properties - Protons and neutrons in the nucleus and electrons
in the orbits circling the nucleus --- protons
and electrons have diff. charges
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Electronic/Computer Age
- Electric Current
- Materials whose atoms give up some electrons
easily are conductors - Materials that hold tightly to their electrons
are insulators - The flow of electrons is current --- Amperes
- 1 amp 6 billion billion electrons flowing past
a point in 1 sec - Electromotive force makes a current flow ---
Volts - A battery provides electromotive force
- Resistance is the opposition to a flow of current
--- Ohms law - V IR or I V/R
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Electronic Components Circuits
- Electronic components or parts control the flow
of electricity - --- each component has its own symbol
- Circuits --- different forms in which components
are connected - Schematics --- drawings that show plans for
circuits - A resistor is used to control the flow of current
--- 0.1 106 ? - Color coded bands indicate the resistance in ohms
- Semiconductors are neither good insulators or
good conductors, e.g silicon - A diode is made using a semiconductor, it lets
current flow in only one direction
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Electronic Components Circuits
- Transistor
- A resistor that lets a small amount of current
control the flow of a much larger amount of
current, e.g. motors, computers - It is a square wafer a few thousandths of an inch
on a side - A thermistor has a resistance that changes with
temperature - A photoresistor has a resistance that changes
with the amount of light hitting it - Printed Circuits
- Solder is a method of joining two wires together
- Wires contact causes an unintended flow of
current --- short circuit --- use of insulation - A printed circuit board is a thin board of an
insulating material like fiberglass - The conducting paths are photographically placed
over it
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Electronic Components Circuits
- Once components are mounted on the board, they
can be soldered by an automatic soldering machine - Integrated Circuits
- It provides a complete circuit on a tiny bit of
semiconductor - They are often less than 1/10th of an inch in
length and width - The drawing of a chip is photographically reduced
to form a mask - Chips have replaced large bulky circuits and are
quite less in volume and price - Computers are built using large ICs
- Analog and Digital Circuits
- An analog circuit works with analog signals
- In digital circuits, a voltage above a certain
value is coded as a 1 and a voltage below that
value is coded as a 0.
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