AGK - Electrics 1

Electrics chapter 1 on Aircraft Gen Knowledge

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  • Created by: Gul
  • Created on: 03-06-09 08:03

Circuits

  • Electric current: Flow of charge
  • Current measured in amperes
  • Charge measured in coulombs (6.24x10^18)
  • Electricity flows from -ve to +ve

A/C electrical system consists of 3 parts:
1. Source (battery/generator)
2. Distribution system (busbar)
3. Loads (galley power)

  • When 'open circuit' occurs in electrical supply system, the loss of continuity will prevent its working components from functioning.
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Energy

Energy = capacity to do work

Work & energy measured in Joules

Generator can transform one type to another (mech + chem to elec)

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EMF - electromotive force

EMF - electromotive force

  • The energy converted to elec energy per C of charge by electric source
  • Measured in volts.

Potentional difference

  • Diff between two points in circuit
  • 'electrical pressure'
  • Measured in V
  • V = IR
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Static Electricity

Static elec generated & stored in a/c

Dispersed in flight thru static wick dischargers on TE of a/c or tailplane

Static dischargers

  • located on TE of a/c or tailplane
  • disperse elec in flight
  • reduce interference with comms
  • reduce risk of transfer of elec chargers between a/c & electrified clouds


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Bonding

  • A/c component parts bonded together with conductive wire & straps
  • Protect a/c against lightning
  • Reduce radio interference
  • Set a/c to single potential
  • 'Earth' electrically connecting a/c to ground to disperse unwanted static
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Resistors in Series + Parallel

Series:

  • Rtotal = R1 + R2 + R3 + ....

Parallel

  • 1/Rtotal = 1/R1 + 1/R2 + 1/R3 ...

With two resistors in parallel:

  • Rtotal = R1R2/R1 + R2

For mixed layouts, always solve parallel first then add series network.


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Kirchoff's Laws

Current Law

Sum of currents meeting at a junction is zero


Voltage Law

Sum of voltages in a clsoed loop is zero

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Power

  • Rate of doing work.
  • P = IV
  • Measured in Watts
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