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Electronics
Section 2
Robotics, Electronics, and Fluid Power
Objectives
By the end of the unit, the students will be able to:
1.
2.
3.
4.
5.
6.
State what Electronics are
State why Electronics are important
Demonstrate how to draw an Electronics System
Demonstrate how to wire an Electronics System
State what resistors are and how to read them
State what capacitors and transistors are and what
function they have
What are Electronics
What is Electronics?
Answer:
Electronics is electronic components,
integrated circuits and electronic systems
used to make such devices as miniature
electronics circuits and wireless technology
Why are Electronics
important
Electronics are important because they
allow us to perform various tasks just by
pushing a button or turning a knob.
Sensors now allow equipment that could
hurt someone to sense them and shut off.
The cars are equipped with electronics like
airbag systems, ABS brakes, anti spinning
system and burglar alarm. Modern
electronics have also revolutionized medical
diagnosis by introducing new techniques
like ultrasonic imaging systems
Drawing a Electronics System
Just like Pneumatics, Electronics uses
symbols to represent different pieces and
currents. You have to talk the system out
to make sure you aren’t forgetting
anything or overloading the system.
Resistors
Resistors are like check valves in a Pneumatic
system. They limit or prevent flow of electricity
through the system in one direction but allow it
to flow freely in the other. The difference is
that a resistor provides resistance to the
system only allowing a certain amount of
electricity to flow through so as not to short
circuit the system. Resistors are read using
different colors and will be explained on the
following pages.
Resistors
Black Brown Red Orange Yellow Green Blue Violet Gray White
0
1
2
3
4
5
6
7
8
9
Reading Resistors
Match first color with
first number
 Match second number with
second color
 Third color tells you how
many zeros to add at end

Examples


Blue, Red, Blue = 62,000,000 Ohms or
62M Ohms
530 Ohms = Green, Orange, Brown
color code
Capacitors
A capacitor is a storage device in an electronics
system. It is kind of like a short term battery that
only holds a little amount of electricity. It cannot
produce electrons, rather just store them. A capacitor
is measured in Farads, Microfarads, and Picofarads.
The more Farads the more watts your system can
handle. For example, a 2 Farad capacitor can handle
2000 watts. A 1 Farad capacitor can handle 1000
watts. The difference between a Capacitor and a
Battery is a capacitor will dump its entire charge in
under a second where a battery takes minutes to
completely discharge.
Capacitor cont’d
The capacitor in its simplest form consists of 2
metallic plates that are close to each other but
are not touching. The material that separates
the metallic plates is called a dielectric and can
be ceramic, air, Mylar film, Tantalum and even a
paste substance known as electrolyte.
Capacitor symbol with battery
Capacitor with Light Bulb
You can connect
this system
up until the light
bulb goes out
then remove the
battery.
Replace the battery
with a wire
and the bulb will go
on for as
long as the
capacitor holds its
energy.
Transistors
The Transistor is a 3 lead device having
a Base, Collector, and Emitter. By
applying the correct polarity across
these leads you can cause the
transistor to amplify weak signals,
switch higher circuit loads with a small
signal input, and perform various
functions for the circuit it is used in.
Ohm’s Law
Voltage = E
Current = I
Resistance = R
Ohm’s Law states that:
Voltage (E) = Current (I) x Resistance (R)
Current (I) = Voltage (E) / Resistance (R)
Resistance (R) = Voltage (E) / Current (I)