3 - Elec 1

Question 1

The greeks noticed that when amber was rubbed with some other materials it became? A) B) C) D)

Answer 1

Charged

Question 2

Charged amber attracted such materials as dried ______ and _______? A) B) C) D)

Answer 2

Leaves; Wood Shavings

Question 3

Around the middle 1700’s, Benjamin Franklin called these two kinds of electricity _______ and _______? A) B) C) D)

Answer 3

Positive; Negative

Question 4

Scientists think electricity is produced by very tiny particles called ____ and ____? A) B) C) D)

Answer 4

electrons; protons

Question 5

Actually, matter is anything that has _____ and occupies______? A) B) C) D)

Answer 5

weight; space

Question 6

The _____ are the basic materials that make up all matter. A) B) C) D)

Answer 6

elements

Question 7

A compound that is made up from the element hydrogen and the element oxygen? A) B) C) D)

Answer 7

water

Question 8

_____ _____ is made from the element sodium and the element chlorine A) B) C) D)

Answer 8

Table salt

Question 9

An atom contains three types of subatomic particles that are of interest in electricity? A) B) C) D)

Answer 9

electrons, protons, and neutrons

Question 10

The protons and neutrons are located in the center, or ______ of an atom. A) B) C) D)

Answer 10

nucleus

Question 11

How does one atom of an element differ from another? A) B) C) D)

Answer 11

by the number of protons in the nucleus

Question 12

The proton is one-third the diameter of an electron; but is 1840 times _____ than the electron A) B) C) D)

Answer 12

heavier

Question 13

The proton has a _____ electrical charge A) B) C) D)

Answer 13

positive

Question 14

The charges on an electron and proton are called? A) B) C) D)

Answer 14

electrostatic charges

Question 15

The law of electrical charges is that the particles with_____ charges repel each other and those with _____ charges attract each other. A) B) C) D)

Answer 15

like; unlike

Question 16

The repulsive force protons exert on one another in the nucleus of an atom have little effect because? A) B) C) D)

Answer 16

protons are relatively heavy

Question 17

A neutral ion contains the same number of _____ and ______? A) B) C) D)

Answer 17

electrons; protons

Question 18

Charged atoms are called? A) B) C) D)

Answer 18

Ions

Question 19

The elements of all the known elements can have up to ______ shells A) B) C) D)

Answer 19

7

Question 20

Copper, Cu has how many valence electrons? A) B) C) D)

Answer 20

1

Question 21

The second electron shell cannot hold more than ____ electrons A) B) C) D)

Answer 21

8

Question 22

Electricity is produced when electrons are _____ from their atoms. A) B) C) D)

Answer 22

freed

Question 23

Materials from which electrons are very difficult to free? A) B) C) D)

Answer 23

Insulators

Question 24

The name given to the effect of pressure in causing electrical charges? A) B) C) D)

Answer 24

Piezoelectricity

Question 25

Light in itself is a form of energy, and is made of small particles of energy called? A) B) C) D)

Answer 25

photons

Question 26

Electric current travels at the same speed as light; which is? A) B) C) D)

Answer 26

186,000 miles per second

Question 27

An electron leaves the negative side of the battery for each electron that enters the _______ ________. A) B) C) D)

Answer 27

positive side

Question 28

When a good conducting wire is put directly across the terminals of a battery or generator, a _______ is produced? A) B) C) D)

Answer 28

short circuit

Question 29

____ _____ flows from low potential to a high potential, or between any difference of potential? A) B) C) D)

Answer 29

Electron current

Question 30

The electrical charge that an object gets is determined by the number of _____ that the object lost or gained? A) B) C) D)

Answer 30

electrons

Question 31

Light can be produced by electricity without much heat by these 3 methods? A) B) C) D)

Answer 31

Fluorescence, phosphorescence and electroluminescence

Question 32

Any conductor that carries an electric current will act like a? A) B) C) D)

Answer 32

magnet

Question 33

What 3 ways can you demagnetize a magnet? A) B) C) D)

Answer 33

striking, heating, a rapid reversing field

Question 34

A compass needle will point to the earth's magnetic? A) B) C) D)

Answer 34

North pole

Question 35

Electric current is developed when many ____ _____ in wire are moved in the same direction. A) B) C) D)

Answer 35

Free electrons

Question 36

Magnetic lines of force are called? A) B) C) D)

Answer 36

Flux lines

Question 37

Some materials resist the passage of flux lines somewhat. This property is known as? A) B) C) D)

Answer 37

reluctance

Question 38

A close wound solenoid coil will create? A) B) C) D)

Answer 38

a stronger magnetic field

Question 39

A special relay used to keep current flowing through the relay even after the main switch is released. A) B) C) D)

Answer 39

holding relay

Question 40

Similar to the relay, except the electromagnet coil cannot stay continuously energized A) B) C) D)

Answer 40

buzzer

Question 41

What keeps the current flowing out of the generator in the same direction at all times? A) B) C) D)

Answer 41

Commutator

Question 42

If a commutator is not used, the current will change direction, this is called? A) B) C) D)

Answer 42

Alternating current