AC

AC

1. Electro-magnetism

   • Lines of flux cannot cross
   • Lines of flux flow from north to south
   • Maxwells screw rule
     • The magnetic field around the conductor flows in a clockwise direction

2. Z-Impedance

3. X-Reactance

   • XL-Inductive reactance
   • Xc-Capacitive reactance

4. Magnetic flux-phi

5. Magnetic flux density-T(Tesla) Weber

6. EMF

   • e=B(teslas)xL(metres)xV(metres/second)
   • When a conductor cuts through a magnetic field, at right angles to the magnetic flux, an emf is induced
   • Flemings right hand rule
     • Thumb-Direction of motion, First finger-Field, Second finger-Current

7. Sine wave quantities

   • Frequency=1/Time period
   • Time period=1/Frequency
   • Vrms=0.707xVpeak
   • Irms=0.707xIpeak
   • Vpeak=1.414xVrms
   • Ipeak=1.414xIrms

8. AC Distribution