Basic Electricity and Electronics

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1
What is the difference between the conventional flow of electricity and electron flow?
Conventional flow is the interpretation of electricity flowing from positive to negative. Electron flow depicts flow through a circuit as negative to positive. Electron flow is the actual direction of current flow ina circuit.
2
How can you find the polarity of an electromagnet?
Wrapping ones LEFT hand around a conductor coil with the fingers encircling the coil in the direction of electron flow (negative to positive), the thumb points to the north pole of the electromagnet.
3
What constitutes a capacitor?
Two conductors separated by an insulator (dielectric).
4
What is the purpose of a capacitor?
Capacitors store electrical energy in electrostatic fields
5
What is the basic unit of capacitance?
The Farad
6
Why should electrolytic capacitors not be used in Alternatic Current circuits?
Electrolytic capacitors are polarized. Since Alternatic Current changes direction in the circuit, an electrolytic capacitor passes current in one direction, but blocks it in another.
7
What is meant by inductance?
The ability to store electrical energy in electromagnetic fields
8
What is the basic unit of inductance?
The Henry
9
Given the inductance and the frequency of an AC circuit, how would calculate the inductive reactance caused by the coil?
Xl = 2πfL
10
Does a capacitor cause current to lead or lag the voltage in an AC circuit?
Capacitors cause current to lead the voltage.
11
Does an inductor cause current to lead or lag the voltage in an AC circuit?
Inductors cause current to lag the voltage.
12
What is the basic unit of power in a DC circuit?
The Watt
13
What happens to the current in a DC circuit if the votlage is increased but the resistance remains the same?
Current increases
14
What are five sources of electrical energy?
Heat
Chemical
Pressure
Magnetism
Light
15
What law of electricity is the most important for an aircraft mechanic to know?
Ohm's Law
16
What are the elements of Ohm's law?
Voltage, Current, and Resistance / E = IR
17
What is the name of the law which describes the relationship between Voltage, Current, and Resistance?
Ohm's law
18
What is the Basic equation of Ohm's law?
E = IR
19
What is Kirchoff's Voltage Law?
The algebraic sum of all Voltages across a circuit must equal ZERO. Rather that the sum of all individual voltage drops in a circuit must equal the source voltage.
20
What is the formula for determining power?
P = IE
21
What is Faraday's Law?
The EMF (voltage) generated in a conductor is proportional to the rate of change of the magnetic flux through the coil or wire. When relative motion exists between a magnet and a conductor, EMF is induced in the coil or wire and current will flow.
22
What is Lenz's Law?
When EMF is induced in a circuit, the current which flows will generate a magnetic field which opposes the change in magnetic flux. Induced EMF and current produce a magnetic field which opposes the change in current or magnetic flux.
23
What is the Right-Hand Rule for motors?
INDEX finger: Direction of magnetic flux
MIDDLE finger: Direction of current
THUMB: Motion of wire or loop
24
What is meant by a Kilowatt?
1,000 watts
25
What instrument is used to measure current flow?
Ammeter
26
What is a Megaohm?
1,000,000 ohm of resistance
27
When measuring resistance of a component with an ohmmeter, should the circuit be energized?
No, there should be no power to the circuit
28
What instrument is used to measure electrica resistance?
The ohmmeter
29
What instrument is used to measure continuity in an elecrtical circuit?
An ohmmeter
30
What unit is battery capacity expressed?
amp-hour
31
What instrument is used to measure the specific gravity of the electrolyte in a lead-acid battery?
A hydrometer
32
What is voltage?
Electromotive Force. Voltage can be thought of as the pressure which "pushes" electrons through a conductor.
33
What is the basic unit of voltage?
The volt
34
What instrument is used to measure voltage?
The Voltmeter
35
To measure voltage is the meter placed in series or parallel with the source voltage?
In parallel
36
What is the voltage across each resistor connected in paralel across a 12 volt source?
12 volts will drop across each resistor
37
What is the open circuit voltage of a lead-acid battery?
2.1 volts per cell
38
How is output voltage regulated in an AC alternator?
Varying the strength of the AC exciter field (field voltage)
39
What is electrical current?
The flow of electrons in the circuit.
40
What is the basic unit of current flow?
The Ampere
41
Wht part of an amp is a milliamp?
One thousandth of an amp (0.001)
42
What two things happen when current flows through a conductor?
HEAT is generated
MAGNETIC FIELD encircles the conductor.
43
To measure current through a component, is the ammeter placed in series or parallel with the component?
In series
44
What formula is used to find current when resistance and voltage are known?
I = E/R
45
What is meant by resistance in an electrical circuit?
Opposition to the flow of current (flow of electrons)
46
What is the basic unit of electrical resistance?
The Ohm
47
What four things affect the resistance of a conductor?
Length
Cross-sectional area
Material
Temperature
48
How can you tell the resistnace of a composition resistor?
By the Color bands on the body of the component
49
What formula is used to find resistance when current and voltage are known?
R = E/I
50
What is meant by Impedence?
Total opposition to the flow of alternating current (vector sum of Resistance, Capacitive reactance, and Inductive reactance)
51
What is the unit of measure of Impedence?
The Ohm
52
How is resitance calculated in a series circuit?
Sum of individual resistances
53
How is resistance calculated in a parallel circuit?
Either Resistance divided by the number of resistors
the recip rule
division of product and sum depending on the number of resistors and their value.
54
What is the total resistance of three 12-ohm resistors connected in series?
36 ohm
55
What is the total resistance of three 12-ohm resistors connected parallel?
4 ohms
56
What is the formula for power in a DC circuit?
P = IE
57
What is the relationship between mechanical power and electrical power?
1 hp = 746 watts
58
What is meant by true power in an AC circuit?
Product of circuit voltage and current that is in phase with the voltage.
59
What unit is Ture Power expressed?
Watts
60
What is meant by Apparent Power in an AC circuit?
Product of voltage and current without taking into account phase angle
61
What unit is Apparent Power expressed?
Volt-amps
62
What is meant by Reactive Power in an AC circuit?
The power consumed in the Inductive and Capacitive Reactances in an AC circuit

This could als be called wattless power
63
In what unit is Reactive Power expressed?
Volt-Amps Reactive

Kilo-Volt-Amps Recative
64
What is meant by power factor in an AC circuit?
The RATIO between True Power and Apparent Power.
65
How many watts of power are consumed by a 1/5 HP, 24 volt DC electric motor that is 75% efficient?
1/5 HP -- (.2)(746) = 149.2
149.2/.75 = 198.93 watts
66
How much current passes through each of three resistors connected in series if the total current is 3 amps?
3 amps passes through each resistor.
67
How much current passes through each of three equal resistors connected in parallel if the total current is three amps?
1 amp
68
What is meant by the capacity rating of a lead-acid battery
The number of hours a battery can sustain a given current flow
69
What electrolyte is used in a lead-acid battery?
Sulfuric acid and water
70
Does the specific gravity of a lead-acid battery increase or decrease as the battery becomes discharged?
It decreases
71
What is the specific gravity of a fully charged lead-acid battery?
1.275 to 1.300
72
How many cells are there in a 24-volt lead acid battery?
12 cells
73
What is the range of temperatures of the electrolyte in a lead-acid battery that does not require correction when measuring specific gravity?
70 to 90 F
74
How do you treat a lead-acid battery compartment to protect it from corrosion?
Coated with an ASPHALTIC (tar base) paint OR POLYURETHANE ENAMEL
75
How do you neutralize spilled electrolyte from a lead-acid battery?
Solution of Sodium Bicarbonate and water
76
How high should the electrolyte level be in a fully serviced lead-acid battery?
Only up to the level of the indicator in the cell.
77
Why is the closed-circuit voltage of a lead-acid battery lower than its open-circuit voltage?
Voltage is dropped across the internal resistance of the battery.
78
What gases are released when a lead-acid battery is charged?
Hydrogen and Oxygen
79
What is the electrolyte used in a NiCad battery?
Potassium Hydroxide and water
80
Why is a hydrometer not used to determine the state of charge of a NiCad battery?
The specific gravity of the solution does no change appreciably as the state of charge changes.
81
Is the electrolyte level of a NiCad battey at its lowest when the battery is charged or discharged?
Fully Discharged
82
What is the result of cell imbalance of a NiCad battery?
Low internal resistance causes current to flow between unbalanced cells, generating heat.
83
What is thermal runaway?
Large current flow casused by a decrease in internal resistance. The heat produced by this current is more than the cells can dissipate. More heat lowers internal resistance further. This continues until the battery is destroyed.
84
How can thermal runaway be prevented?
By carefully monitoring the temperatures and controlling charging current to prevent an excess of curent from flowing into the battery
85
How is it possible to know when a NiCad bettery is charged?
Completely discharge the battery, then a constant current charge to 140% its amp-hour capacity.
86
What is used to neutralize spilled electrolyte of a Nicad battery?
Solution of Boric Acid and water.
87
What is a transfomer and how does it work?
Transformers use the Alternating Current of one circuit to induce Alternating Current in another circuit. Depending on the ratio of windings of the two halves on the transformer the EMF can be stepped up or down.

The two circuits are not connected. The magnetic field lines of one half cut across the coils of the other half-- inducing EMF and current.
88
What three things must an electric circuit contain?
Load
Source
Conductor
89
What is meant by continuity in an electric circuit?
The circuit is complete. There is an unbroken loop between source, load and ground (return)
90
What is the basic function of a switch?
To control the fow of current in a circuit.
91
What is a relay?
Relays are electrically operated switches (also can be describes as magnetically operated switches).

A small amount of current can be used to energize a coil which then closes contacts to control a larger current.
92
What is the function of a current limiter?
A heavy-duty fuse. Used to protect parts of an electrical system. Usually have ratings of 30 amps, and used to protect a single electrical bus.
93
What materials are fixed resistors made out of?
Carbon composition are common.
-Carbon film
-Metal-oxide
-Metal Film
-Metal glaze
94
What are two main types of variable resistors?
Potentiometer and Rheostat.
95
How can you tell the resitance of a composition resistor?
By the color bands on one end of the body of the resistor
96
What happens to the current in a conductor if the length of the conductor is doubled, and all other parameters are unchanged?
The resistance of the conductor would double, and therefore the current would decreases.
97
Explain the basic concept of digital logic: RAM, ROM, NVRAM, LOGIC GATES, INVERTERS, RECTIFIERS, & FLIP-FLOPS
Transistors are used in digital electronics to construct circuits that act as digital logic gates. The purpose and task of a device is achieved by manipulating electric signals through the logic gates. Thousands of transistors can be placed on a chip to create a digital logic landscape through which a component's signals are processed.

RAM- Random Access Memory. Short term storage of information on a computer
ROM- Read-Only Memory. Data on a computor that is not lost when the system is shutdown (non-volatile)
NVRAM- Non-Volatile Random Access Memory. RAM that is stored even when power is lost.
LOGIC GATES- Give an output signal based on one or more input signals. The input signal is either voltage (1) or no voltage (0). Basic gates are AND OR also NOT
INVERTER- Converts one signal to another (1) to (0) or (0) to (1)
RECTIFIER- Converts AC voltage to DC voltage
FLIP-FLOP- A electrical circuit that can store a signal in binary. That binary state can be changed with an input signal.
98
What are binary numbers?
Base 2. A number system in which the only two digits are 1 and 0
99
What is electrostatic discharge?
Electrostatic charges that can build up on a component or a persons body. The release of these charges can cause damage to solid state components and integrated circuits. This is prevented by wearing a grounding strap and grounding the components being worked on.
100
What type of drawing depicts electrical components with respect to each other within a circuit?
An electrical schematic.
101
What are three types of DC circuits with respect to the placement of the various components in the circuit?
Series
Parallel
Complex (series-parallel)
102
What are two general types of AC Motors used in aircraft systems?
Induction motors and synchronous motors
103
What is the formula to determine the speed of an AC motor?
RPM = (120 x Freq) / Number of Poles
104
What formula is used to determine the Frequency of an AC generator?
Hz = (Number of poles x RPM) / 120
105
In what types of applications is a series wound DC motor most often used?
Applications that require a high starting torque (starters, landing gear)
106
What are the two principle parts of a DC motor?
Armature assembly
Field assembly
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