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13067707 Englisch

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Principles of electrical 202

CIVIL
- Current leads the voltage by 90 degrees
- Inductance lags the voltage by 90 degrees
D.C
- Sources of Electromotive force
  - Electromagnetic induction
  - Electrochemistry (battery)
  - Photoelectric effect (solar panel)
  - Thermeoelectric effect (heat)
  - Piezoelectric effect (use flint)
- Effects of an electric current
  - Thermal
  - Chemical
  - Magnetic
- Kierchoff's current law - Current driving at a point must equal the same when leaving the point It = I1 + I2 + I3
  - Kierchoff's voltage law - Voltage around the ciruit is equal to zero (or supply voltage) Vs = v1 + v2 + v3
- Molecule - Smallest part of any material is a molecule and is made of 1 or more atoms
  - Protons are positively charged
    - Gain electron ion becomes negative
      - Lose electron ion becomes positive
  - Electrons are negatively charged
- Current - A flow of electrons through a metal conductor
  - Resistance - Pauses a current flow, opposition to current flow
    - Electromotive force (V) - Driving force of electrons
- mm - m - x 10 -3 m - mm - x 10 3 mm2 - m2 - x 10 -6 m2 - mm2 - x 10 6
  - Parrallel circuits
    - 1/Rt = 1/R1 + 1/R2 + 1/R3
    - Rt = R1 x R2 ----------- R1 + R2
  - Series circuit
    - Rt = R1 + R2 + R3
    - Current stays the same