![]() ![]() A bus bar is used as a terminal in the aircraft electrical system to connect the main electrical system to the equipment using electricity as a source of power.All non-essential electrical equipment should be turned off to conserve battery power.With the alternator half of the switch in the OFF position, the entire electrical load is placed on the battery.In addition, an alternator switch is installed which permits the pilot to exclude the alternator from the electrical system in the event of alternator failure.Many aircraft are equipped with a battery switch that controls the electrical power to the aircraft in a manner similar to the master switch.Turning the master switch to the ON position provides electrical energy to all the electrical equipment circuits except the ignition system.This would be the equivalent of turning your car keys to run electrical components without actually starting the car.The electrical system is turned on or off with a master switch.Pilot Handbook of Aeronautical Knowledge,.Some aircraft have two batteries, allowing for offsetting replacement times, but also bring extra connections, wire, etc.Trickle charger (not standard charger) may be beneficial to the battery life.During operations at low engine RPM, the electrical needs must be drawn from the battery, which can quickly be depleted.Most direct-current generators will not produce a sufficient amount of electrical current at low engine RPM to operate the entire electrical system.Electrical energy stored in a battery provides a source of electrical power for starting the engine and a limited supply of electrical power for use in the event the alternator or generator fails.Learn more about alternator maintenance, read the AOPA's articles on caring for your alternator and 500-hour inspections.an produce electrical power even if the battery is dead.Not sensitive to errant electrical spikes or reversed polarity.Require more maintenance than alternators.Electrical noise and static that radiate to other avionics.Pilots who have experienced the rapid dimming of a landing light as they reduce engine rpm on short final will understand one of the drawbacks of a generator-powered system.Generators don't produce rated output until engine rpm is up in the midrange of operation - typically above 1,400 rpm.As the armature rotates, the copper wires move through a magnetic field that is produced by permanent magnets which produces electrical power.In the generator, the conductors are copper wires that are wound around an armature that is bolted to the drive pulley.Some aircraft have receptacles to which an external ground power unit (GPU) may be connected to provide electrical energy for starting which can be very useful, especially during cold weather starting.The electrical output of an alternator is more constant throughout a wide range of engine speeds.Alternators produce sufficient current to operate the entire electrical system, even at slower engine speeds, by producing alternating current, which is converted to direct current.Alternators rotate a magnetic field inside stationary coils of wires.Alternators and/or Generators are engine-driven power source accessories which supply electric current to the electrical system for in-flight operations while maintaining a sufficient electrical charge on the battery.Pilot Handbook of Aeronautical Knowledge, Electrical Schematic. ![]()
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