Terminology&Symbols

Terminology&Symbols

1. Power

   • Symbol = P
     • P = Additive
   • Measured in Watts
     • Watts = W

2. Current

   • Symbol = I
     • Electric Current symbol
     • I = Constant
   • Measured in Amperes
     • Amperes = A
     • Use Amp meter to measure
   • Measurement for Electrical Current
   • Flow of Electrons
     • I = Q/t
       • Q = C
         • C = Coulombs
       • t = time
         • time = s
           • s = seconds

3. Resistance

   • Symbol = R
     • R = Additive
   • Measured in Ohms
     • Ohms = Ω
     • Use Ohmmeter to measure
     • Ohms Law
       • Current through a fixed resistance ..
         • .. is directly proportional to Voltage
       • I up = R down
         • R up = I down
   • Oposition to current Flow

4. Voltage

   • Symbol = E
     • Source Voltage = E
       • Kirchoff's Voltage Law
         • Sum of voltage rises & drops ..
           • .. = zero in closed loop
     • e = additive
   • Measured in Volts
     • Volts = V
       • Voltage Drop = V
         • Potential Difference
     • Electrical Pressure
     • Use Voltmeter to measure
   • Measurement for potential difference

5. Electromotive Force

   • Symbol = EMF
     • EMF = E
       • EMF Measured in Volts

6. P= I x E

   • E = I x R

7. Coulombs

   • Symbol = C
   • Quantity of charge in coulombs = Q
     • One unit of charge = 6.24x10^18
       • 1 Coulomb = 6.24x10^18
   • Q = I x t
     • t = Time
       • Time measured in seconds
         • Seconds = s