Component Identification & Schematic Symbols

1
Component Identification Schematic Symbols

• Electronics 1
• CVHS

2
Basic Elements of a Circuit

• Three Essential Elements
• Load
• Complete Path
• Power Source
• Additional Elements
• Control Device
• Protective Device

3
What is a Schematic

• A schematic is a drawing that uses symbols to
  represent a complete electronic circuit.
  Schematics are necessary when building and
  troubleshooting circuits to easily understand the
  electrical path between components.

Schematic Showing Complete Circuit
4
Resistors

• Provide resistance to electrical energy (voltage
  drop)
• Labeled with a resistor color code (displays
  resistance value in ohms tolerance )
• Physical size determines power (Wattage) value
• Schematic symbol

5
Capacitors

• Store quickly discharge electrical energy
• Labeled with measure of capacitance
• Unit of measure farads (f)
• Schematic symbol

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Diodes

• Permit one-way flow of electricity
• Made of semiconductor material
• Schematic symbol

7
Transistor

• Acts as an electronic amplification device
  (Controls large current with a small current)
• Made of semiconductor material
• PNP of NPN
• Schematic Symbols

8
Coils

• Made of coiled wire wrapped around some type of
  core material (plastic, metal, air)
• Units of measure henrys (h)
• Schematic symbol

9
Transformer

• Made of two or more separate coils wrapped around
  a core material
• Change voltage/ amperage levels (step-up/
  step-down)
• Schematic symbol

10
SCR

• Acts as electronic switching device
• Once triggered it stays on until all power is
  removed from the circuit
• Made of semiconductor material
• Schematic symbol

11
Light Sensitive Components

• Photo cell
• Changes resistance Light-dark
• Schematic symbol

• Solar cell
• Produces electricity from light
• Schematic Symbol

12
Lamp

• Neon

• LED

• Incandescent

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Power Source

• DC power source symbol

• A power source is anything used to energize an
  electric circuit.
• Usually a power source is either a battery or
  some form of AC power (wall outlet, generator,
  etc.)

• AC power source symbol

14
Ground

• Chassis Ground symbol

• You can think of ground as the negative side of
  the circuit, or the connection to the chassis of
  a piece of electronic equipment, but usually
  ground refers to the earth, as all household
  receptacles should have a proper earth ground

• Earth ground symbol

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Review
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7
5
2
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8
3
16
Bonus
17
Factor Conversion

• Throughout this course, you will work with
  numbers in many different factors.
• It is important that you understand how to
  convert these numbers from one factor to another
  in order to have an answer that makes sense
• The most common factors used in electronics are
• Tera (T), Giga (G), Mega (M), Kilo (K),
• milli (m), micro (µ), nano, (n), and pico
  (p)
• Remember, in order to convert between factors,
  you just need to find the number of steps away
  from the base unit and the direction of decimal
  movement.

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Factor Conversion
(µ)

• Practice, Convert the following
• 23 pf _________________ f
• .52 MO _________________ µO
• 374 Kh _________________ mh
• .0008 TW _________________ mW

0.000,000,000,023
520,000,000,000
374,000,000
800,000,000,000