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3.2: Electricity and Magnetism

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    3273
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    Electricity and magnetism

    There is a direct relationship between electricity and magnetism. If there is current flow in a conductor there will be lines of force created around the conductor. If you could look at the magnetic field formed around a current-carrying conductor, it would look like Figure 8.

    electromagneticField.png
    Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    1. Electromagnetic field
      L1D3_LT2_fig6.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    2. Opposite currents repel
      likeCurrentsAttract.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    3. Like currents attract
      L1D3_LT2_fig7.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    4. Flux in a loop
      L1D3_LT1_fig10.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    5. Electromagnet
      simpleGenerator.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    6. Simple generator
      SineWave.png
      Figure \(\PageIndex{1}\): (CC BY-NC-SA; BC Industry Training Authority)
    7. AC sine wave

      If it takes one second to complete the cycle from A to B, we would say the frequency is 1 hertz. Household utility AC current is supplied to the customer at 60 hertz, meaning 60 cycles per second.

      Single-phase power supply

      Single-phase electric power refers to the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, and with a few large electric motors. Single-phase power comprises two independent voltages that are carried on two separate conductors. The two hot lines are called Line 1 and Line 2. They are typically found in residential and small commercial applications.

      Three-phase AC power supply

      Three-phase electrical power refers to a type of electrical power distribution in which three or more energized electrical conductors are carrying alternating currents. Examples of three-phase power systems are industrial applications and power transmission. Three-phase power supply is used to power large motors and other heavy loads. A three-phase system is generally more economical than equivalent single-phase or two-phase systems at the same voltage.

      Three-phase power comprises three independent voltages that are carried on three separate conductors. The three hot lines are called Line 1, Line 2, and Line 3. Three-phase power is typically found in commercial and industrial buildings.

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