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Component Symbols&
Information
Prof. Dr. Moustafa M. MohamedVice Dean, Faculty of Allied Medical Science,
Pharos University in Alexandria
Resistors
• Resistors – An electrical component that opposes or resists the flow of current.
• Values in Ohms (units of resistance) color coded or military specification coded.
K = kilo = 103
M = mega = 106 m = milli = 10-3
Resistors (cont.)
Lead Styles• Axial
• Radial
• I.C. (SIP and DIP)
• Surface Mount
Resistors (cont.)
Types• Carbon Composition – Fixed• Carbon Film - Fixed• Metal Film – Fixed• Wire Wound – Fixed or variable
Resistors (cont.)
Graphic Symbols• Fixed – Zig Zag with 3 points on top and bottom, with
60º angle between zigs, 1/8 to 3/16” tall.
• Variable – Rotary, slide, tapped, switched
• Reference Designation = R
Potentiometer
General – (Rotary, slide, tapped,
switched)
Rheostat
– Used to control current flow.
Capacitors
• Capacitors – A component that stores electrical energy between conductive plates separated by a dielectric insulation material.
• Values in Farads (unit of storage) and working voltage lettered on the body.– μ = micro = 10-6
– n = nano = 10-9
– p = pico = 10-12
Capacitors (cont.)
Types• Electrolytic – fixed – polarized• Tantalum – fixed – polarized• Paper – fixed – nonpolarized• Mica – fixed – nonpolarized• Ceramic – fixed – nonpolarized• Air – variable - nonpolarized
Capacitors (cont.)
Lead Styles• Axial
• Radial
• Surface mount
Capacitors (cont.)
Graphic Symbols
• Nonpolar fixed
• Variable
• Polar Fixed
• Reference Designation = C
+
•Used for coupling /passing AC signals and filtering frequencies (tuning, crossovers)
•Used for storing energy in DC applications (power supplies, filters)•Used for passing AC signals
Inductors
• Inductors – Component that stores electrical energy in the form of a magnetic field. Consists of a coil of wire wrapped around a core of air or magnetic material.
• Also known as – Induction coils, coils, or chokes• Values in Henries (units of storage) color coded or
lettered– m = milli = 10-3
Inductors (cont.)
Types• Air Core – Fixed• Iron Core – Fixed and Adjustable• Ceramic Core – Fixed• Toroidal Core - Fixed
Inductors (cont.)
Lead Styles• Wire Lead
• PC Mount
• Eye Terminal
Inductors (cont.)
Graphic Symbols
Preferred
Iron Ceramic
Adjustable
•Used in filtering and tuning circuits•Reference Designation = L
Transformers
• Transformers – Two inductors constructed side by side with no electrical connection between them. Used to transform energy from one side of the device to the other.– Values in volts, amps, primary (input) and
secondary (output), labeled on units
Transformers (cont.)
Types• Primary-Secondary Ratio
– 1:1 isolation style– Step-up– Step-down– Centertapped– Multitapped– Air core – fixed output– Iron core
• Fixed output• Adjustable outputs• Multitapped outputs
– Ceramic core– fixed output
Transformers (cont.)
Lead Styles• Wire Lead
• PC Mount
• Eye Terminal
Transformers (cont.)
Graphic Symbols• Air Core
• Iron Core
• Iron Adjustable
• Iron Multitapped
• Used for power supplies• Reference Designation = T
Diodes
• Diodes – Semiconductor component that allows current to flow in only one direction. It is also used to regulate voltage and emit light.– Values rated in current flow and voltage threshold
and recovery time.
Diodes (cont.)
Types
• Rectifier• Zener• Tunnel• LED• LCD• Laser• Photosensitive
• Standard Part Numbers -1NXX – 1NXXXX
Diodes (cont.)
Lead Styles• Axial• Radial• Stud• Surface Mount
Diodes (cont.)
Graphic Symbols• Rectifier/Small signal• Zener• Tunnel• LED• Photosensitive
• Reference Designation– CR, LED, DS, PSD
Assignment
State the functions of Capacitor and mention 3 different types of it.