Electricity 1

Question 1

When amber was rubbed with other materials, it became charged with a mysterious force. What was it rubbed with?

Answer 1

Dried leaves and wood shavings.

Question 2

Benjamin Franklin called the attractive and repellant kinds of electricity…

Answer 2

Positive and Negative

Question 3

Electricity is produced by ______ and ________.

Answer 3

Electrons and Protons

Question 4

Matter is…

Answer 4

Anything that has weight and occupies space.

Question 5

______ are the basic materials that make up all matter.

Answer 5

Elements

Question 6

Water is made of

Answer 6

Hydrogen and oxygen.

Question 7

Salt is made of sodium and

Answer 7

Chlorine.

Question 8

The atomic number is the same as an atom’s number of

Answer 8

Protons.

Question 9

A proton is 1/3 the diameter of an electron but contains _______ times more mass.

Answer 9

1840

Question 10

Charged atoms are called

Answer 10

Ions

Question 11

The atoms of all the known elements can have up to _____ shells.

Answer 11

Seven

Question 12

Electricity is produced when____ are freed from their orbits.

Answer 12

electrons

Question 13

Materials that have electrons that are freed easily are called ______?

Answer 13

Conductors

Question 14

Insulators are materials where their electrons are freed _____

Answer 14

difficultly.

Question 15

Electricity as a result of rubbing materials together is called _____.

Answer 15

Triboelectricity

Question 16

Piezoeletricity is the result of _______

Answer 16

Pressure being converted into electricity.

Question 17

Electric current travels at ________.

Answer 17

the speed of light

Question 18

When a good conductor is put directly across the terminals of a power source,

Answer 18

a short circuit is produced.

Question 19

Electric current travels from ___ potential to ___ potential.

Answer 19

Low, high

Question 20

Charge is determined by the number of electrons that the object has ________.

Answer 20

lost or gained

Question 21

Light can also be produced from _______, _______, and ________.

Answer 21

Fluorescence, phosphorescence, and electroluminescence.

Question 22

Any conductor that carries an electric current will act like a ______.

Answer 22

Magnet

Question 23

You can demagnetize an object by _______, _________, and _______.

Answer 23

Striking, heating, and applying a rapidly reversing field.

Question 24

The compass needle points to the _____ magnetic pole.

Answer 24

North

Question 25

Flux lines are compressed in the center of the loop to create a strong field. The north side is the side that the lines of flux ____.

Answer 25

Come out

Question 26

A close-wound solenoid will create a ____ magnetic field.

Answer 26

Stronger

Question 27

A holding relay has an extra set of contacts that _________ after the main switch is closed.

Answer 27

Stays closed

Question 28

A buzzer’s contacts are arranged so that the electromagnetic coil cannot stay ________ continuously.

Answer 28

Energized

Question 29

The _________ switches the wires outside the generator while the rotor turns so that the current will flow in the same direction through the meter at all times.

Answer 29

Commutator

Question 30

An electric circuit consists of ________, _________, and ________.

Answer 30

1. A power source 2. Conductors 3. A load

Question 31

A ______ is any device that uses electric energy.

Answer 31

Load

Question 32

EMF is measured in _____.

Answer 32

Volts

Question 33

2 factors determine how much current will flow in a DC circuit, ______, and _______.

Answer 33

Applied voltage and conductance of the wires and the load

Question 34

is how easily electricity flows in a circuit.

Answer 34

Conductance

Question 35

______ has the greatest conductance.

Answer 35

Silver

Question 36

Resistance of a material (element) depends on ________.

Answer 36

The number of free electrons it has

Question 37

The greater the cross-sectional area of a conductor, the _____ the resistance.

Answer 37

Lower

Question 38

The resistance of the load is normally much _____ than the wiring.

Answer 38

Greater

Question 39

Every power source has some internal ________.

Answer 39

Resistance