# 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)

• 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
• 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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