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The purpose of this PowerPoint presentation is to introduce the recipient or reader to three
main electronic components that can be found in everyday electronic devices around the
house.
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Click on Resistor
Click on Capacitor
Click on LED (Light
Emitting Diode)
Resistors
Resistor, a basic component of electric circuits.
Resistors are used to produce heat, as in an
electric toaster or furnace; to produce light, as
in an incandescent light bulb; to provide an
electrical bypass, as in the shunt in an ammeter;
to regulate the electric power entering a device,
as in a light dimmer or radio volume control;
and to set voltages within an electric circuit.
Resistors
Resistors - the most ubiquitous of electronic components. They are
a critical piece in just about every circuit. And they play a major role
in all major appliances and electronic devices. Resistors are made
for the express purpose of creating a precise quantity of resistance
for insertion into a circuit. They are typically constructed of metal
wire or carbon, and engineered to maintain a stable resistance
value over a wide range of environmental conditions.
Unlike lamps, they do not produce light, but they do produce heat as electric power is dissipated by them
in a working circuit. Typically, though, the purpose of a resistor is not to produce usable heat, but simply
to provide a precise quantity of electrical resistance.
Resistors
Because resistors dissipate heat energy as the electric currents
through them overcome the "friction" of their resistance,
resistors are also rated in terms of how much heat energy they
can dissipate without overheating and sustaining damage.
Naturally, this power rating is specified in the physical unit of
"watts.“ The power rating of any resistor is roughly proportional
to its physical size. Note in the first resistor photograph how
the power ratings relate with size: the bigger the resistor, the
higher its power dissipation rating. Also note how resistances
(in ohms) have nothing to do with size!
Resistors
Resistors can be found in all electronic devices and like
 Television sets
 Radios
 Computers
 Tablets
 Cell phones
 And many more devices.
Resistors Applications
Resistors are used as part of electrical networks and electronic circuits.
• In general, a resistor is used to create a known voltage-to-current ratio in an electric circuit. If the current in a circuit is known, then
a resistor can be used to create a known potential difference proportional to that current. Conversely, if the potential difference
between two points in a circuit is known, a resistor can be used to create a known current proportional to that difference.
• Current-limiting. By placing a resistor in series with another component, such as a light-emitting diode, the current through that
component is reduced to a known safe value.
• An attenuator is a network of two or more resistors (a voltage divider) used to reduce the voltage of a signal.
• A line terminator is a resistor at the end of a transmission line or daisy chain bus (such as in SCSI), designed to match impedance
and hence minimize reflections of the signal.
• All resistors dissipate heat. This is the principle behind electric heaters.
References for Resistors
Author Unkown, (2009, August 18th ). "Resistor“, HowStuffWorks.com. http://science.howstuffworks.com/resistor-info.htm
21 November 2014.
Storr, W. (2014) Types of Resistor, from the Basic Electronics Tutorials Site http://www.electronicstutorials.ws/resistor/res_1.html, 21 November 2014.
Capacitors
In a way, a capacitor is a little like a battery. Although
they work in completely different ways, capacitors
and batteries both store electrical energy. A capacitor
is much simpler than a battery, as it can't produce new
electrons -- it only stores them.
Inside the capacitor, the terminals connect to two
metal plates separated by a non-conducting substance,
or dielectric. You can easily make a capacitor from
two pieces of aluminum foil and a piece of paper. It
won't be a particularly good capacitor in terms of its
storage capacity, but it will work.
Capacitors
The picture to the left depicts a router as you can see
there are several capacitors installed into this printed
circuit board. Capacitors are very critical to most
electronics devices.
The versatility of capacitors makes them very practical
to use in many levels of the electronics fields.
Capacitors
Capacitors can be found in all electronic devices and like
 Television sets
 Radios
 Computers
 Tablets
 Cell phones
 And many more devices.
Resistors Applications
Resistors are used as part of electrical networks and electronic circuits.
• In general, a resistor is used to create a known voltage-to-current ratio in an electric circuit. If the current in a
circuit is known, then a resistor can be used to create a known potential difference proportional to that current.
Conversely, if the potential difference between two points in a circuit is known, a resistor can be used to create
a known current proportional to that difference.
• Current-limiting. By placing a resistor in series with another component, such as a light-emitting diode, the
current through that component is reduced to a known safe value.
• An attenuator is a network of two or more resistors (a voltage divider) used to reduce the voltage of a signal.
References for Capacitors
Brain, Marshall, and Charles W. Bryant. (2007, September 17th) "How Capacitors Work". HowStuffWorks.com.
http://electronics.howstuffworks.com/capacitor.htm, 23 November 2014.
Storr, W. (2014, November 22nd) Introduction to Capacitors, from the Basic Electronics Tutorials Site http://www.electronicstutorials.ws/capacitor/cap_1.html, 23 November 2014.
LED ( Light-Emitting Diode )
Stands for "Light-Emitting Diode." An LED is
an electronic device that emits light when an
electrical current is passed through it. Early
LEDs produced only red light, but modern
LEDs can produce several different colors,
including red, green, and blue (RGB) light.
Recent advances in LED technology have
made it possible for LEDs to produce white
light as well.
LED ( Light-Emitting Diode )
LEDs are commonly used for indicator lights (such as power
on/off lights) on electronic devices. They also have several other
applications, including electronic signs, clock displays, and
flashlights. Since LEDs are energy efficient and have a long
lifespan (often more than 100,000 hours), they have begun to
replace traditional light bulbs in several areas. Some examples
include street lights, the red lights on cars, and various types of
decorative lighting. You can typically identify LEDs by a series
of small lights that make up a larger display. For example, if you
look closely at a street light, you can tell it is an LED light if
each circle is comprised of a series of dots.
LED ( Light-Emitting Diode )
The energy efficient nature of LEDs allows
them to produce brighter light than other types
of bulbs while using less energy. For this reason,
traditional flat screen LCD displays have started
to be replaced by LED displays, which use
LEDs for the backlight. LED TVs and computer
monitors are typically brighter and thinner than
their LCD counterparts.
LED applications
LED’s are the next generation of lighting, they could be used ANYWHERE!
With millions of existing products on the market, and more on the way each day, chances are LEDs are used in
almost everyone. From indication lights, computer components, watches, medical devices, tanning equipment,
the list goes on and on.
• Sign Applications With LEDs
Full Color Video, Monochrome Message Boards, Traffic/VMS, Transportation - Passenger Information
• Illumination With LEDs
Architectural Lighting, Signage (Channel Letters), Machine Vision, Retail Displays, Emergency Lighting (Exit
Signs), Neon and bulb Replacement, Flashlights, Accent Lighting - Pathways, Marker Lights
LED applications
• Signal Application With LEDs
Traffic, Rail, Aviation, Tower Lights, Runway Lights, Emergency/Police Vehicle Lighting
• Automotive Applications With LEDs
Instrument Panels & Switches, Courtesy Lighting, CHMSL, Rear Stop/Turn/Tai, Retrofits, New
Turn/Tail/Marker Lights
• Consumer Electronics & General Indication
Household appliances, VCR/ DVD/ Stereo/Audio/Video devices, Toys/Games Instrumentation, Security
Equipment, Switches
LED applications
• Mobile Applications With LEDs
Mobile Phone, PDA's, Digital Cameras, Lap Tops, General Backlighting
• Photo Sensor Applications With LEDs
Medical Instrumentation, Bar Code Readers, Color & Money Sensors, Encoders, Optical Switches, Fiber Optic
Communication, View Application Detail, Click Here
References for LED ( Light-Emitting Diode )
Harris, Tom, and Wesley Fenlon. (2002,January 31) "How Light Emitting Diodes Work". Retrieved on 22
November 2014, HowStuffWorks.com. http://electronics.howstuffworks.com/led.htm
(Unknown author) (2014) LED. Retrieved on 22 November 2014.
From Encyclopædia Britannica. http://www.britannica.com/EBchecked/topic/340594/LED