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1

Ohms Law

________: the current in a circuit equals the voltage difference divided by the resistance.

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2

Atoms

________ contain particles called protons, neutrons, and electrons.

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3

Resistance

________: the tendency of a material to oppose the flow of electrons, changing electrical energy into thermal energy and light.

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4

Metal Wire

In a(n) ________, or any material, electrons are in constant motion in all directions.

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5

Electrons

________ are bound more tightly to some atoms and molecules.

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6

Cell

A(n) ________ consists of two electrodes surrounded by a material called an electrolyte.

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7

Battery

A(n) ________ can provide the voltage difference that is needed to keep current flowing in a circuit.

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8

Electrical Conductors

________ have much less resistance than insulators.

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9

Insulator

________: A material in which electrons are not able to move easily.

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10

negative charges

Positive and ________ exert forces on each other.

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11

Copper

________ is an excellent conductor and has low resistance to the flow of electrons.

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12

parallel circuits

In ________, the current follows more than one path.

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13

Chemical Reactions

________ in batteries produce a voltage difference between the positive and negative terminals.

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14

Circuit

________: A closed path that electric current follows.

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15

Plastic

The ________ coating around wires is an insulator.

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16

parallel wiring

Houses, automobiles, and most electrical systems use ________ so individual parts can be turned off without affecting the entire circuit.

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17

Protons

________ have positive electric charge and electrons have negative electric charge.

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18

Series Circuit

A(n) ________ provides only one path for the current to follow.

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19

Transfer of Electrons

Rubbing two materials together can result in a(n) ________.

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20

Electric Resistance

The ________ of most materials usually increases as the temperature of the material increases.

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21

Frictional Force

The ________ between two surfaces in contact is due to the attractive electric forces between the atoms on the two surfaces.

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22

Presence of Electric Charges

The ________ can be detected by an electroscope.

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23

Static Electricity

________: The accumulation of excess electric charge on an object.

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24

Voltage Difference

________: related to the force that causes electric charges to flow.

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25

Electric Current

________ is measured in amperes.

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26

Flight of Stairs

The movement of an electron in an electric current is similar to a ball bouncing down a(n) ________.

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27

Circuit Breaker

A(n) ________ contains a piece of metal that bends when the current in it is so large that it gets hot.

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28

Wet - Cell Battery

A(n) ________ contains several wet cells connected together.

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29

Earth

________ is a large, neutral object that is also a conductor of charge.

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30

Voltage Difference

________ is measured in volts.

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31

Series Circuits

________ are used in flashlights and some holiday lights.

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32

Parallel Circuit

________: contain two or more branches for current to move through.

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33

Cell

The ________ is called a dry ________ because the electrolyte is a moist paste, not a liquid solution.

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34

Series Circuit

________: the current has only one loop to flow through.

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35

Static Electricity

The accumulation of excess electric charge on an object

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36

Law of Conservation of Charge

Charge can be transferred from object to object, but it cannot be created or destroyed

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37

Conductor

A material in which electrons are able to move easily

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38

Insulator

A material in which electrons are not able to move easily

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39

Charging by Contact

The process of transferring charge by touching or rubbing

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40

Charging by Induction

The rearrangement of electrons on a neutral object caused by a nearby charged object

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41

Electric Current

The net movement of electric charges in a single direction

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42

Circuit

A closed path that electric current follows

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43

Resistance

the tendency of a material to oppose the flow of electrons, changing electrical energy into thermal energy and light

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44

Ohms Law

the current in a circuit equals the voltage difference divided by the resistance

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45

Parallel Circuit

contain two or more branches for current to move through

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46

Electrical Power

The rate at which electrical energy is converted to another form of energy

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