Electrical Systems

Question 1

To have a continuous flow of electricity what three conditions must be present?

Answer 1

• An EXCESS of electrons in one place
• A LACK of electrons in another place
• A path between the two places

Question 2

In simple terms what is Magnetism?

Answer 2

The controlled movement of electrons

Question 3

An automotive battery is a source of what type of energy and how does it create energy

Answer 3

Chemical Energy from a reaction in the battery providing an excess of electrons in one place and and a lack of electrons in another place

Question 4

Moving a wire (conductor), through an already existing magnetic field (permanent magnet) can produce electricity and is referred to as:

Answer 4

Induction

Question 5

During induction the amount of electricity produced depends on what three conditions?

Answer 5

• the strength of the magnetic field
• the number of wires that are passed by the magnetic field
• the speed in which the magnetic field moves past the wires

Question 6

What are the 5 common ways electricity can be produced

Answer 6

• Magnetism
• Chemical
• Photoelectrical
• Thermoelectrical
• Piezoelectrical

Question 7

Electrical current describes:

Answer 7

The movement or flow of electricity

Question 8

The greater the number of electrons flowing past a given point in a given amount of time:

Answer 8

The more current the circuit has

Question 9

______________ is electrical pressure

Answer 9

Voltage

Question 10

Electromotive force is measured in what unit?

Answer 10

Volts

Question 11

How can the resistance to electrical flow be measured?

Answer 11

Resistance creates heat, heat can be measured to determine the amount of resistance and the unit to measure this is OHMS

Question 12

A completed circuit is referred to as:

Answer 12

Closed Circuit

Question 13

An incomplete circuit is referred to as:

Answer 13

And open circuit

Question 14

If Voltage remains constant, as circuit resistance goes up:

Answer 14

Current goes down

Question 15

If Voltage remains constant, as circuit resistance goes down:

Answer 15

Current will go up

Question 16

Describe Voltage drop

Answer 16

The energy used to allow current to flow through a load

Question 17

Power is the rate of doing electrical work and is expressed with what unit

Answer 17

Watts

Question 18

One watt is equal to:

Answer 18

One Volt multiplied by one amp

Question 19

Describe Current Flow

Answer 19

A movement from higher potential to lower potential

Question 20

E = I / R
What does “E” represent?

Answer 20

voltage (electromotive force)

Question 21

Which type of resistor is commonly used in automotive circuits?

Answer 21

Fixed value

Question 22

Which unit measures electrical current

Answer 22

Amperes (amps)

Question 23

What’s the purpose of using an iron core at the centre of an electromagnetic?

Answer 23

It has decreased reluctance

Question 24

In a series circuit the current is always the ____________

Answer 24

Same throughout the circuit

Question 25

Power windows and locks often use what?

Answer 25

Solid state circuit breaker

Question 26

The current in an electrical circuit _________ when the resistance increases

Answer 26

Decreases

Question 27

Electrical power is measured in _____

Answer 27

Watts

Question 28

What materials resist the flow of a current

Answer 28

Resistors

Question 29

How many paths does a series circuit allow current to flow?

Answer 29

One

Question 30

What makes a conductor a conductor?

Answer 30

3 or less electrons in the outer valence shell causing a low resistance to the flow of current

Question 31

What metals make a good conductor

Answer 31

Copper, silver, aluminum

Question 32

What’s the most common type of wire used in automotive

Answer 32

Multi-strand copper wire

Question 33

The longer the wire:____________

Answer 33

The greater the resistance

Question 34

If the diameter of a wire is doubled: ___________

Answer 34

The resistance for any given length is cut in half

Question 35

As the temperature of a wire increases: __________

Answer 35

The resistance increases

Question 36

What are the 5 basic parts to an automotive circuit?

Answer 36

1- Power sources
2- Conductors
3- Loads
4- Controllers
5- Circuit protection devices

Question 37

Solenoids are:_______

Answer 37

Electromagnets with movable cores used to change electrical current flow into mechanical movement

Question 38

The magnetic field around every magnet is called a:

Answer 38

Flux field

Question 39

Reluctance is: __________

Answer 39

The resistance that a magnetic circuit offers to a line of flux.