1. Cells, Batteries, Lamps, Resistors, Switches, Wires, Cables, Fuses
Circuit Components
Cells, Batteries, Lamps, Resistors, Switches, Wires, Cables, Fuses

2. Cells and Batteries Def. Cell Def. Battery
Electrochemical device consisting of two eletrodes made of different materials and an electrolyte. The chemical reaction between the electrodes and the electrolyte produces voltage.
Def. Battery
Two or more cells electrically connected together

3. Cells and Batteries Classification Primary Secondary Dry Wet
Not Rechargeable
Secondary
Rechargeable
Dry
Electrolyte is a paste or gel
Sealed
Wet
Filled with acid
Must have vents

4. Cells and Batteries Ratings
Capacity refers to the amount of energy the cell can provide under specified conditions
Conditions
Temperature
Current drain
Discharge Schedule
Final Output Voltage

5. Miniature Lamps Incandescent Tungsten Filament Wedge Base
Screw Type Base
Bayonet Base
Flasher Lamp
Uses bimetallic strip

6. Miniature Lamps Neon Glow Glass bulb filled with neon gas
Requires volts to light (ionization)
Once lit, voltage can drop 10-15%
Resistors must be used to limit current
Requires no more than 2mA of current

7. Miniature Lamps Light Emitting Diodes Used as indicator lamps
Requires limiting resistors
Operate at approx. 20mA
Leads must be correct polarity

8. Resistors Used to control current or divide voltage
Classification and symbols
Fixed
Variable
Adjustable
Tapped
Power ratings
Tolerance Factors
Color Codes

9. Switches
Types
Toggle
Slide
Rocker
Push Button
Lever

10. Switches Symbols and Names SPST Single Pole, Single Throw SPDT
Single Pole, Double Throw
DPST
Double Pole, Single Throw
DPDT
Double Pole, Double Throw

11. Wires and Cables Wires Electric Cables Coaxial Cable Flat Cable
Solid or Stranded
Electric Cables
Shielded to isolate from electromagnetic fields
Used in extension and telephone cords
Coaxial Cable
Shielded used to connect transmitter and receivers
Flat Cable
Used to digital circuits

12. Wires and Cables Specifications Gage Number
Smaller the number the larger the diameter of the wire
When measuring the gage always measure the bare wire.

13. Fuses Short Circuit Fast burn – sensitive electrical devices
Undesired conductor path exists in the circuit
Examples
Fuses protect against shorts
Fast burn – sensitive electrical devices
Medium burn – when a spike is not expected
Slow burn – Electric motor, short duration
Circuit breakers