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A.C.

1. Generation

   • 25KV-Generator
     • 400KV/275KV-transmission
       • 132KV-National Grid
         • 11KV-local substation
           • 400V-3 Phase
             • 230V-Domestic(single phase)
   • Generators
     • Use mechanical energy to create electrical energy.

2. star connection

   • VL=Square root 3 times Vp
     • Ip=IL

3. Delta connection

   • VL=Vp
     • IL=Square root 3 times Ip

4. Impedence

   • total opposition to current flow
     • combined=Z=Square root R Squared+(Xc-Xl) Squared
       • Resistance(R)
         • R=V Divided by I
       • Reactance(X)
         • Capacitive(Xc)
           • XL=I Divided by 2Pi times F times C
             • measured in farrads
         • inductive(XL)
           • XL=2 Pi Times F times L
             • measured in henries

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