1. Resistance Impedance Energy Storage Resistor R Ohms Reactance Z Ohms
DC Direct Current
AC Alternating Current
Electric Field
Capacitance
Magnetic Field
Inductance
Resistor R
Ohms
Reactance Z
Ohms
Capacitor C
Farad
Inductor L
Henry
Oppose flow of DC current
Oppose flow of AC current
2 or more conductive surfaces separated by an insulator
Coil of wire Ω f
Low at high frequency Ω f
Low at low frequency
Ohms
Ohms
Potentiometer R
Ohms
Variable Resistor, varies resistance like adjusting volume

2. Diodes Transistors Visual Indicators Switch Relay LED Lamp
PNP
NPN
FET
Source
Drain
Gate
Collector
Emitter
Base
Field Effect Transistor
Anode
Cathode
(marked with a stripe)
One way current
Can be used to rectify AC to DC current
Electronically control flow of current
On/Off
Amplify (gain)
(3 layers of semiconductor)
Visual Indicators
Switch
Relay
Single Pole Single Throw
LED
Light Emitting Diode
Lamp
Connect – Disconnect Circuits
A switch controlled by an electromagnet

3. Other Schematic Symbols Integrated Circuit
Fuse
Transformer
High voltage
Protect from current overload
Interrupt power in case of overload
Protects from excessive current that may cause a fire
Low voltage
Commonly used to change 120V AC house current to a lower AC voltage
Other Schematic Symbols
Integrated Circuit
Device that combines several semiconductors and other components into one package
Battery
Antenna
Variable inductor

4. Resonant or Tuned Circuit Schematics
Inductor and Capacitor together forms filter
Show connection of electrical components
Hint: in this schematic transistor 2 controls current flow to the lamp.