Electricity 324

Question 1

What is electricity?

Answer 1

Movement of electrons along a conductor.

Question 2

Current is measured in

Answer 2

Amperes or AMPS

Question 3

Volts are:

Answer 3

The measure of force moving electrons.

Question 4

Current is:

Answer 4

The rate at which electrons flow. Measured in Amperes or AMPS

Question 5

How do we produce electricity?

Answer 5

Friction (Static Electricity)
Heat (Thermocouples)
Light (Photoelectricity)
Pressure (Piezoelectric Cells)
Chemical Action (Batteries)
Magnetism (Alternators/Generators)

Question 6

What is an electron?

Answer 6

The smallest part of an atom, possessing a negative charge.

Question 7

What is a conductor?

Answer 7

materials, usually metals, that have loosely held electrons in the outer orbit of their makeup.

Question 8

What is an insulator?

Answer 8

Opposite of a conductor, does not have loosely held electrons in the outer orbit.

Question 9

What is a circuit?

Answer 9

A path electricity can take;

always circular in nature between the area of negative and positive charge.

Question 10

What is an AMP ?

Answer 10

RATE OF FLOW
Represents the current flow at a certain point.
FLOW

Question 11

What is a VOLT?

Answer 11

The force that pushes electrons.

PRESSURE

Question 12

What is resistance? How is it measured?

Answer 12

Electrical Friction, it is measured in OHMS.

Question 13

What is a WATT?

Answer 13

What is the measurement of power .

VOLTS X AMPS = WATTS
pressure) (flow

Question 14

Why do we use electricity the way we do?

Answer 14

Electricity allows light bulbs to burn.
It allows cars to have generators and electricity like batteries.
Causes chemicals to recharge and hold energy.

Question 15

How many WATTS are in 1 hp.

Answer 15

746 WATTS = 1 HP

Question 16

What are the two types of Current

Answer 16

Direct Current

Alternating Current

Question 17

Direct Current (DC)

How does it flow? 
How is it generated? 
How far does it travel? 
What is it usually used for? 
Name something DC is used in and what kind of energy?

Answer 17

Flows in one direction.
Generated by moving a coil of wire in a magnetic field.
Doesn’t go very far.
Used for shorter circuits.
Most batteries use DC, which is chemical energy.

Question 18

Alternating Current (AC)

How does it flow? 
How far does it travel? 
What is the rate of flow for a standard household?
Why is it economical?  
How is it generated? 
What is the phase? 
What do the hertz measure?

Answer 18

It flows in both directions, constantly changing.
Efficient for long distance flow.
60hz rate for the average household.
It’s cheaper and more efficient than DC.
Generated by moving coil of wire in a magnetic field.
400hz 115 Volts
Hertz is cycles per second.

Question 19

What three things does a simple circuit contain?
How is it controlled?
What are some examples of consuming devices you could use on this?

Answer 19

A circuit with a power supply, switch, and consuming device.

Controlled by opening and closing the switch/circuit.

Lightbulb, motor, heater.

Question 20

What are switches used for?
What does that do?
What are different types?

Answer 20

Used to open or close a circuit.

Used to activate electrical devices.

Mechanical Vs. Automatic

Question 21

Wet Cell Batteries can/can not be recharged?

Answer 21

Can be recharged

Question 22

What kind of alternator do we have in the C172?

Answer 22

28v 60amp

Question 23

Alternators spin a ___________ inside a __________, and requires/does not require brushes to pick up current.

More/Not Efficient and operate on a _____ RPM and are_______ in weight.

Answer 23

Alternators spin an electromagnet inside a coil. Requires no brushes to pick up current.

More efficient and operate on a lower RPM and are lighter in weight.

Question 24

Generators spin a ___________ inside a __________, and requires/does not require brushes to pick up current.

More/Not Efficient and operate on a _____ RPM and are_______ in weight.

Answer 24

Generators spin a coil inside a heavy magnet and require brushes to pick up current.

Not as efficient as an alternator.

Question 25

If an ammeter is reading -10 the battery is providing ______ power than the _______

Answer 25

More power than the battery.

Question 26

What is thermal runaway?

Answer 26

Thermal runaway refers to a situation where an increase in temperature changes the conditions in a way that causes a further increase in temperature, often leading to a destructive result. It is a kind of uncontrolled positive feedback.

Question 27

What does the ammeter indicate?

How do you know when you have an alternator failure?

Answer 27

Indicates rate of charge, or discharge of battery.

Loss of alternator indicated by a negative reading.

Question 28

What does load meter indicate?

How do you know you have an alternator failure ?

Answer 28

Load meter indicates amount of total electrical load in amps that’s placed on the alternator.

Load meter indicates 0 you have an alternator failure.

Question 29

What are busses?

How do they connect?

Answer 29

Power distribution points with clusters of electronic components connected to one terminal.

Usually a metal strip connects them.

Question 30

Preflight for the electrical system: (3)

Answer 30

1. Check alternator, belt, tight good shape.
2. Use battery cart for cold winter starts
3. Check operation before takeoff