AGK - Electrics 1 Electrics chapter 1 on Aircraft Gen Knowledge 3.0 / 5 based on 1 rating ? OtherOtherAll boards Created by: GulCreated 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. 1 of 8 Energy Energy = capacity to do work Work & energy measured in Joules Generator can transform one type to another (mech + chem to elec) 2 of 8 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 3 of 8 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 4 of 8 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 5 of 8 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. 6 of 8 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 7 of 8 Power Rate of doing work. P = IV Measured in Watts 8 of 8
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