330 Basic Electricity

Question 1

The symbol E is used to represent what in electricity?

Answer 1

Voltage

Question 2

What happens to the total resistance in a wire, if its length is doubled?

Answer 2

The resistance is doubled

Question 3

In an electrical circuit, what is the name of the unit used in measuring current?

Answer 3

Ampere

Question 4

Atoms consist of_______.

Answer 4

Protons, neutrons, & electrons

Question 5

The nucleus contains __________.

Answer 5

Protons & neutrons

Question 6

Why doesn’t the nucleus of the atom containing the positive protons fly apart due to their repulsive action on each other?

Answer 6

The nucleus is held together by forces which are even stronger than the electrical forces. This nonelectrical force is called the
attractive nuclear force.

Question 7

What is the outermost shell of an atom?

Answer 7

Valance shell

Question 8

What formula is used to calculate shell capacity?

Answer 8

An easy way to remember a shell’s capacity
is by using the formula 2n^2, where ‘n’ is the number of the shell.

Question 9

If the valance shell of an atom contains ________, the electrons can ________ , making the substance _________.

Answer 9

fewer than four
the electrons can be easily dislodged
a good conductor

Question 10

Atoms with more than four electrons in their valance shell are said to be?

Answer 10

good insulators

Question 11

What are 3 ways in which electrons can be dislodged from their valance shell?

Answer 11

heat
chemical energy
subjecting the atom to electrical fields

Question 12

Electrons in ________ valance shells are more stable than electrons in _________ valance shells.

Answer 12

completed
incomplete

Question 13

What makes copper an excellent conductor?

Answer 13

The fact that its valance shell contains only one electron.

Question 14

When the valance shell of an atom contains fewer than ________ electrons, the electrons can be easily dislodged making it a ________ conductor.

Answer 14

4
good

Question 15

Materials such as _________ make good conductors.

Answer 15

gold
silver
& copper

Question 16

What 3 methods can be applied to dislodge and electron from it’s valance shell?

Answer 16

the application of heat
the use of chemical energy
by subjecting the atom to electrical fields

Question 17

What are two examples of good insulators?

Answer 17

glass
& rubber

Question 18

When an atoms contains 4 or more electrons in its valance shell it is a good __________.

Answer 18

insulator

Question 19

Static electricity is electricity at ________.

Answer 19

rest

Question 20

Electrons are neither created nor destroyed, but are

Answer 20

either displaced or transferred to another material

Question 21

LIke charges will?

Answer 21

repel

Question 22

Unlike charges will?

Answer 22

attract

Question 23

The energy created by the tendency of the atom to return to its neutral state is what is harnessed to manipulate electricity to perform work.

Answer 23

This rule works everywhere but the atom itself, where all the protons are located in the nucleus and all the electrons stay in their respective shells.

Question 24

electron flow
high to low

Answer 24

The flow of electrons will continue until both ends of the conductor reach a common electrical potential or no potential difference across the conductor.

Question 25

electrical properties of atoms and ion demonstrate how voltage is measured in a basic circuit demonstrate how voltage drops are measured around a cicuit

Question 26

What is electron current flow and the electron current flow theory?

Answer 26

Current flow is the movement of electrically charged particles in a given direction. This current flow is explained as the movement of electrons being repelled from a negative source and attracted to a positive terminal. This is referred to as the electron current flow theory.

Question 27

Define voltage.

Answer 27

A unit of electrical potential difference and electromotive force equal to the difference of potential between two points in a conducting wire carrying a constant current of one ampere when the power dissipated between these two points is equal to one watt and equivalent to the potential difference across a resistance of one ohm when one ampere is flowing through it.

Question 28

How is voltage generated?

Question 29

Voltage is electrical pressure caused by

Answer 29

opposing charges

Question 30

Voltage is required to move _______ through a circuit.

Answer 30

current

Question 31

Voltage is also referred to as

Answer 31

the difference of electrical potential or electromagnetic force (EMF) that exists between two quantities of unequal charges

Question 32

There are many ways by which voltage or a difference in potential can be established such as

Answer 32

by friction thermal energy magnetic induction chemical action (battery) solar cell (converts photons to electrical energy)

Question 33

If opposite chargers are connected by a conductor, the electrical pressure or voltage will cause (blank) in the wire.

Answer 33

electron/ current flow

Question 34

The unit of electrical pressure is called the

Answer 34

volt

Question 35

An electrical pressure between any two points in a circuit is called _____ , ______ or ______ .

Answer 35

voltage, electromotive force (EMF) or difference of potential.

Question 36

The resistance of the circuit must be overcome by the voltage across the circuit before the current will flow.

Question 37

Opposition to current flow is referred to as _______.

Answer 37

resistance

Question 38

Overcoming the pull from the nucleus is what causes current flow.

Question 39

The greater the attraction the greater the _______.

Answer 39

resistance

Question 40

What is the unit of measure for resistance?

Answer 40

the ohm

Question 41

If the potential is large or the resistance is small, the resultant current will be large

Question 42

If the potential is small or the resistance is large, the resultant current will be small.

Question 43

How is resistance in materials affected?

Answer 43

Resistance in materials can be affected in 4 ways: the type of material the length of the material cross-sectional area temperature

Question 44

AC vs DC

Question 45

In most materials, an increase in _____ will _____ resistance.

Answer 45

temperature increase

Question 46

The resistance of carbon __________ as the temperature _________.

Answer 46

decreases increases

Question 47

Resistance directly effects how much current can flow.

Question 48

The component or components affected by current flow in a circuit are collectively called the load

Question 49

If a given size of wire is doubled in length, the resistance will be _______.

Answer 49

doubled

Question 50

If the cross-sectional area of a given size of wire is doubled, the resistance will ______.

Answer 50

be halved

Question 51

E subscript S

Answer 51

voltage source

Question 52

load or resistance

Answer 52

R subscript 1

Question 53

The symbol for current is ______.

Answer 53

I

Question 54

as electrons flow through a load they lose energy this causes the voltage on one side of the load to be higher than the other side developing a difference of potential across the load.

Question 55

voltage drop there is an important difference between a voltage produced by a source and a voltage drop across a resistance

Question 56

constant source voltages that will cause current to flow in the same direction at all times and at the same level are referred to as direct current

Question 57

alternating current continually changes direction and magnitude to change the direction of current, the positive and negative terminals of the energy source must continually reverse