Aircraft Electrical Systems Ted Spitzmiller Aircraft Electrical Systems

Aircraft Electrical Systems C-182T Electrical System Aircraft Electrical Systems

Aircraft Electrical Systems What is Electricity? Flow of electrons from one atom to another - + Aircraft Electrical Systems

Aircraft Electrical Systems Like a bucket brigade Aircraft Electrical Systems

Where do we get ‘positive 'attraction— from a battery… Aircraft Electrical Systems

Putting some ‘resistance’ into the flow provides useful ‘work’ Aircraft Electrical Systems

‘Current’ flows in the opposite direction to the electrons Current (I) is the ‘amount’ of electrons flowing Measured in Amps E Voltage (E) is the ‘pressure’ of the electrons Measured in Volts Aircraft Electrical Systems

Aircraft Electrical Systems Moving a coil in a magnet generates electricity to recharge the battery Aircraft Electrical Systems

Aircraft Electrical Systems Two types of ‘current’ Aircraft Electrical Systems

Aircraft Electrical Systems

Why is Electricity Dangerous Minimum current a human can feel depends on current type (AC or DC) and freq. 1 mA of AC at 60 Hz (1/1000 of an amp) 5 mA for DC. High current can cause tissue damage or fibrillation (cardiac arrest) 60 mA of AC (rms, 60 Hz) 300–500 mA of DC AC at 120 V, 60 Hz is an especially dangerous because it usually exceeds the let-go threshold Seriousness of the shock depends on current path through the body Ohms law E=IR Aircraft Electrical Systems

Aircraft Electrical Systems Quiz time Electricity is the ‘flow’ of: Protons Neutrons Electrons Klingons Aircraft Electrical Systems

Aircraft Electrical Systems Question 2 In a DC circuit, the positive force used to make the current flow is often obtained from: Wall socket Battery Alternator Aircraft Electrical Systems

Aircraft Electrical Systems Question 3 To keep a battery from depleting its ‘charge’, rapidly (and perhaps burning up) each item to be powered must provide some form of electrical: Capacitance Inductance Resistance Aircraft Electrical Systems

Aircraft Electrical Systems Question 4 In a light bulb, the electrical resistance is in the form of the: Socket Filament Glass enclosure Aircraft Electrical Systems

Aircraft Electrical Systems Question 5 In an electrical circuit, the amount of electron flow is measured by the: Ammeter Voltmeter Loadmeter Aircraft Electrical Systems

Aircraft Electrical Systems Question 6 The pressure of the electron flow is measured by the: Ammeter Voltmeter Dosimeter Parkingmeter Aircraft Electrical Systems

Aircraft Electrical Systems Question 7 The purpose of a circuit breaker is to: Sense current that may be too high for the circuit. Interrupt the flow of electricity to the ‘load’ Protect the airplane’s electrical wiring Prevent an electrical fire Aircraft Electrical Systems

How much voltage does it take to kill a person? 15,000 volts 120 volts While voltage may be a factor, as little as 30 ma of current can cause ventricular fibrillation.. Aircraft Electrical Systems

What is a ‘short circuit’? A direct path from a ‘ground’ to the positive source of power A abnormal low resistance connection A possible destructive condition in an electrical circuit All of the above Aircraft Electrical Systems