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A.C and D.C

1. Impedance

   • Total opposition to current flow.
   • Resistance- R=v/i. symbol- (R)
     • Capacitive Reactance-Xc=1/2Pifc
       • Measured in farods
   • Reactance- (X)
     • Inductive Reactance-XL=2pifl
       • Measured in Henries

2. Generation

   • 25kv-Generation
     • 400kv-Transmission
       • 132kv-National Grid
         • 11kv-Local Substation
           • 400v/230v-Domestic
             • (Single Phase)
             • 3 Phase

3. Fara Days Law

   • EMF is included in a conductor when it cuts or is cut by a magnetic field.

4. STAR & DELTA

   • IL-Line Current
     • Ip-Phase
       • Vp-Voltage Phase
     • VL-Voltage Line

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