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Electrical circuits > Review booklet > Flashcards

Review booklet Flashcards

1
Q

Substance made up of atoms of more than one type is a?

A

compound

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2
Q

The atomic number of an element refers to the number of _____ in the _____ of the atom?

A

protons and nucleus

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3
Q

Maximum number of electrons that can be in the valence of an atom?

A

8

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4
Q

In orbits further from the nucleus the energy possessed by the electrons increases or decreases?

A

increases

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5
Q

An electron that has broken loose from its atom is what?

A

a free electron

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6
Q

What are good conductors?

A

most metals

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7
Q

According to coulomb’s law, if the distance between two point charges is decreased by four times, the force between the charges will ______ by _________ times

A

increase by 4 times

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8
Q

An atom that has a positive charge posses more or less electrons than protons?

A

less

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9
Q

Five useful applications of electrostatic charge?

A 
Air filters 
Printers
Photocopiers 
Painting 
Dust removal
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10
Q

Two hazards situations caused by electrostatic charge?

A

flammable gas, touching something with a charge

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11
Q

Three ways a body may receive an electrostatic charge?

A

friction
conduction
induction

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12
Q

A force that acts at a distance without physical contact is referred to as which force?

A

magnetic force

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13
Q

refers to the charge at one point with respect to another?

A

electrical potential energy

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14
Q

If one of two charges has its magnitude doubled, then the force between the two charges will ______ by ________ times?

A

increase by two times

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15
Q

Devices designed to change other forms of energy into electrical energy are referred to as?

A

Source

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16
Q

Six methods of producing electricity?

A 
Light
heat
friction
pressure
chemical
magnitism
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17
Q

Device that generates electricity from the suns energy is called?

A

a solar panel

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18
Q

The work-per-unit-charge done by source on the electric charges, to move them against the electric field, is referred to as?

A

electromotive force

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19
Q

Most of the electrical energy used in homes is produced by what?

A

magnetic energy

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20
Q

Law of conservation of energy?

A

energy may neither be created nor destroyed

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21
Q

The solar cell in a simple calculator is called a?

A

photovoltaic cell

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22
Q

The charge on 6.24 x 10 to 18 power is referred to as a ________?

A

coulomb

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23
Q

If four coulombs or charge pass a given point in a conductor over a period of two seconds, current is flowing at the rate of _________ amperes?

A

two

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24
Q

What is the term used to represent the opposition to current flow in an electrical circuit?

A

load/resistance

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25
Q

If the voltage applied to a circuit increases, the current through the circuit?

A

increases

26
Q

air the resistance of a circuit decreases, the current flowing through the circuit?

A

increases

27
Q

if the resistance of a circuit decreases, the power dissipated by the circuit?

A

increase

28
Q

if the voltage applied to a circuit doubles, the power dissipated by the circuit _______ by _________ times?

A

increase by four

29
Q

Ohms law in words?

A

Current flowing is directly proportional to the voltage and inversely to the resistance of the circuit

30
Q

State watts law in words?

A

Power in a circuit is equal to the voltage times the current

31
Q

The product of emf, current and time is ________?

A

energy

32
Q

The product of emf and current is _________?

A

power

33
Q

the product of power and time is __________?

A

energy

34
Q

if the voltage applied across a purely resistive device is made three times larger, the power dissipated by that device is multiplied by ?

A

9

35
Q

If the voltage applied to an electrical circuit is doubled, what happens to the current flowing through that circuit?

A

It will double

36
Q

The diagram that is easiest to understand for a person with little knowledge of electricity is what?

A

Pictorial diagram

37
Q

The type of schematic diagram that shows the power source as two vertical lines in either side of the drawing is called a ?

A

ladder diagram

38
Q

Main difference between a block diagram and a one-line diagram is that to represent the components, a block diagram uses _________ and a one-like diagram uses___________?

A

blocks and symbols

39
Q

Schematic diagrams do not show the _________ relationship between components?

A

physical

40
Q

Type of diagrams in which components are shown as they really appear on diagrams

A

pictorial

41
Q

Diagram that is a type of flow chart is called what?

A

block diagram

42
Q

Type of diagram that is usually the first drawing an engineer does is the?

A

block OR line diagrams

43
Q

Type of diagram that is a circuit map?

A

Wiring diagram

44
Q

Type of diagram that shows a 3-dimensional view of the component is the ?

A

pictorial diagram

45
Q

Which diagram does not show the individual conductors?

A

one line diagram

46
Q

Device that changes electrical energy into other forms of energy is referred to as a ?

A

load

47
Q

A parallel path of low resistance is the definition of a ?

A

short circuit

48
Q

The two main types of damage that are likely to occur because of excessively high current are _________ and ___________

A

thermal and mechanical

49
Q

how does current flow through a load?

A

negative to positive

50
Q

The term that refers to the charge at one point with respect to another point is ?

A

Polarity

51
Q

A fuse or circuit breaker protects a circuit from excessive current by ________ the circuit when too much current flows through it

A

opening

52
Q

When a switch is in the open position , is it on or off?

A

off

53
Q

Current flows through the SOURCE from?

A

positive to negative

54
Q

What are the three necessary components of a circuit?

A

source, load, and conductors

55
Q

What will happen if you connect a DC meter with the wrong polarity?

A

It will deflect below 0 and damage the mater possibly

56
Q

The type of reading error that takes place when you do not look at the needle straight on is referred to as a _________ error?

A

Parallax

57
Q

What are the 3 ratings you must be careful not to exceed when you are using a watt meter?

A

voltage coil, current coil, power

58
Q

If a VOM meter does not have an off position , where should the range selector be left when the meter is not being used?

A

highest a/c voltage range

59
Q

Why should the VOM meter never be left on an ohms setting when the meter is not being used?

A

If there is any continuity between the leads it will drain the battery

60
Q

What must you remember to do every time you switch ranges on an ohmmeter?

A

Zero the meter

61
Q

Bus bars come in 3 different shapes, what are they?

A

Hollow tube, solid square, solid rectangle

62
Q

Conductors come in 3 different types of stranded configurations, name them?

A

concentric, bunch, and rope

Electrical circuits (5 decks)

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