Electricity 1-7 Ch 1 Review

Question 1

Ben Franklin believed in 2 kinds of electricity, what are they?

Answer 1

Positive and negative

Question 2

The Greeks discovered electricity when charged amber attracted what?

Answer 2

Dried leaves

Question 3

Today, scientists think electricity is produced by very tiny particles called _________ and __________.

Answer 3

Protons and electrons

Question 4

A water molecule is made of _________?

Answer 4

2 hydrogen atoms and 1 oxygen atom

Question 5

What is matter?

Answer 5

Anything that has weight and occupies space

Question 6

What is an element?

Answer 6

The basic materials that make up all matter

Question 7

1 molecule of salt is made of:

Answer 7

Sodium & chloride

Question 8

An atom is made of what 3 parts?

Answer 8

Protons, neutrons, and electrons

Question 9

The nucleus contains:

Answer 9

Protons and neutrons

Question 10

The number of protons in the nucleus shows:

Answer 10

How an atom differs from one another

Question 11

Info about protons:

Answer 11

Positively charged, 1/3 the diameter of an electron, and 1840 times heavier than an electron

Question 12

How many electrons does copper have?

Answer 12

29

Question 13

True or false: opposite charges attract, like ones repel.

Answer 13

True

Question 14

What do you call a charged atom?

Answer 14

Ion

Question 15

What makes an atom neutral?

Answer 15

Same number of protons and electrons

Question 16

How many shells does hydrogen have?

Answer 16

1

Question 17

What is a valence shell?

Answer 17

The outer most shell of an atom

Question 18

What type of atoms make the best conductors?

Answer 18

Ones with only 1 electron

Question 19

What do you call a material from which electrons are difficult to free?

Answer 19

Insulators

Question 20

Max number of shells on an atom?

Answer 20

7

Question 21

Max number of electrons in second shell of an atom?

Answer 21

8

Question 22

What is electric flow?

Answer 22

The flow of free electrons

Question 23

6 ways electricity is produced?

Answer 23

CHP, FML. Chemical, heat, pressure, friction, magnetism, light

Question 24

Name of effect of pressure in causing electric charges?

Answer 24

Piezoelectricity

Question 25

What small particles is light made of?

Answer 25

Photons

Question 26

How fast does electric current travel?

Answer 26

The speed of light, 186,000 mi/sec

Question 27

For every electron that leaves the negative side of the battery…

Answer 27

An electron enters the positive side

Question 28

What happens when a conducting wire is put directly across the terminals of a battery?

Answer 28

A short circuit is produced

Question 29

How does electron current flow?

Answer 29

From low to high potential, or between any difference of potential

Question 30

What determines the electric charge of an object?

Answer 30

The number of electrons lost or gained

Question 31

Light Can be produced by electricity without heat via:

Answer 31

Fluorescence, phosphorescence, and electroluminescence

Question 32

Any conductor that carries electric current will act like a:

Answer 32

Magnet

Question 33

How to demagnetize a magnet?

Answer 33

Strike, heat, or place in a rapidly reversing magnetic field

Question 34

Where does a compass needle point?

Answer 34

North magnetic pole

Question 35

Which pole do flux lines come out of?

Answer 35

North Pole

Question 36

True or false: a close-wound solenoid will create a stronger magnetic field

Answer 36

True

Question 37

What is a holding relay?

Answer 37

A relay with an extra set of contacts to keep current flowing through the relay even after the main switch is released

Question 38

A buzzer operates similarly to a relay except:

Answer 38

the contacts are arranged so that the electromagnetic coil cannot stay energized continuously

Question 39

What does a commutator in a generator do?

Answer 39

Keeps current flowing in the same direction

Question 40

If a commutator is not used in a generator, what kind of current will be produced?

Answer 40

AC