Electricity : Chapter 1 - Section 1

Question 1

True or False : All matter is made up of very small particles called atoms.

Answer 1

True.

Question 2

True or False : Atoms are made up of even smaller particles called protons, neurons and electrons.

Answer 2

True.

Question 3

True or False : Neurons are charged, protons and electrons are not.

Answer 3

False. Protons and electrons are charged, neurons are not.

Question 4

True or False : Charge is a physical property.

Answer 4

True.

Question 5

True or False : An object can only have a positive charge.

Answer 5

False. An object can have positive charge, negative charge or no charge.

Question 6

True or False : Charged objects exert a force on other charged objects.

Answer 6

True.

Question 7

What does the law of electric charge state?

Answer 7

The law of electric charge states that charges repel (push away) and opposite charges attract.

Question 8

What type of charge do protons have?

Answer 8

Positive charge.

Question 9

What type of charge do neurons have?

Answer 9

No charge.

Question 10

What type of charge do electrons have?

Answer 10

Negative charge.

Question 11

True or False : Since protons and neurons have opposite charges, they are attracted to each other.

Answer 11

True.

Question 12

True or False : Without electrons and protons being attracted to each other, electrons could not be held in atoms.

Answer 12

True.

Question 13

What is electric force?

Answer 13

The force between charged objects.

Question 14

What two things does the size of the electric force depend on?

Answer 14

1. The amount of charge on each object. 2. The distance between the charges.

Question 15

True or False : The smaller the charge, the greater the electric force is.

Answer 15

False. The greater the charge, the greater the electric force is.

Question 16

True or False : The greater the distance between the charges, the greater the electric force.

Answer 16

False. The closer the charges are, the greater the electric force is.

Question 17

Why are charged things affected by electric force?

Answer 17

Charged things are affected by electric force because charged things have an electric field around them.

Question 18

What is the electric field?

Answer 18

The region around a charged object in which the electric force is exerted on another charged object.

Question 19

True or False : A charged object is attracted or repelled by the electric field acting on it.

Answer 19

True.

Question 20

True or False : Atoms have an equal number of protons and electrons.

Answer 20

True.

Question 21

True or False : Since protons and electrons cancel each other out, atoms are positively charged.

Answer 21

False. Since protons and electrons cancel each other out, atoms don’t have a charge.

Question 22

True or False : An object becomes positively charged when it loses it’s electrons

Answer 22

True.

Question 23

True or False : An object becomes negatively charged when it gains electrons.

Answer 23

True.

Question 24

True or False : An object can become charged by friction, conduction or induction.

Answer 24

True.

Question 25

How does charge by friction occur?

Answer 25

When electrons are “wiped” from one object to another.

Question 26

How does charge by conduction occur?

Answer 26

When electrons move from one object to another by direct contact.

Question 27

How does charge by induction occur?

Answer 27

When charges in an uncharged metal object are rearranged without direct contact with a charged object.

Question 28

True or False : When you charge something by any method, no charges are created or destroyed

Answer 28

True.

Question 29

True or False : Since charges are not created or destroyed, charge is said to be wasted.

Answer 29

False. Since charges are not created or destroyed, charge is said to be conserved.

Question 30

What device can you use to determine if an object is charged?

Answer 30

You can use a device called an electroscope to see if something is charged.

Question 31

True or False : You can use an electroscope to determine if an object's charge is negative or positive.

Answer 31

False. You cannot determine if an object's charge is positive or negative by using an electroscope, you can only tell if it is charged or not.

Question 32

What is an electroscope, and how does an electroscope work?

Answer 32

An electroscope is a glass flask that has a metal rod in it’s rubber stopper; two metal leaves attached to the bottom of the rod. When electroscope is not charged, leaves hang straight down, when electroscope is charged, leaves repel each other (spread apart).

Question 33

True or False : Different materials are used because electric charges move through some materials more easily than they move through others.

Answer 33

True.

Question 34

What is an electrical conductor?

Answer 34

An electrical conductor is material in which charges can move easily.

Question 35

Why are most metals good conductors?

Answer 35

Because some of their electrons are free to move.

Question 36

What is an insulator?

Answer 36

An electrical insulator is a material in which charges cannot move easily.

Question 37

Why don't insulators conduct charges well?

Answer 37

Because their electrons cannot flow freely.

Question 38

What is static electricity?

Answer 38

Static electricity is the electric charge at rest on an object

Question 39

True or False : Charges of static electricity do not move away from the object that they are in (so object keeps it’s charge).

Answer 39

True.

Question 40

What is electric discharge?

Answer 40

The loss of electricity as charges move off of an object.

Question 41

True or False : Sometimes electric discharge happens quickly (flash of light, a shock, crackling noise).

Answer 41

True.

Question 42

Does this diagram represent an atom? ![]()

Answer 42

Yes.