1. Current Electricity (Notes)

Definitions:

Current: Rate of Charge Flow (symbol: I)
   
      - Direct Current (DC): current that flows in a single direction from the power supply through the conductor to a load and back to the power supply
      - Alternating Current (AC): current that continually changes direction

Conventional Current: Model of positive charge flow  (+) to (-)
Ammeter: a current-measuring device
Circuit: complete path of electric current flow from and to the power supply
Voltage: electric potential difference (symbol: V)
Voltmeter: an instrument used to measure potential difference between any two points

Equations: 
1. Current
(Total amount of Charge in Coulombs divided by Time)
I = Q/T, Q = IT, T = Q/I

2. Voltage (Electric Potential Difference)
(energy over charge)
V = E/Q

Circuit Symbols: