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1

Resistance

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

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2

metal wire

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

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3

battery

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

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4

cell

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

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5

Electrical conductors

________ have much less resistance than insulators.

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6

Insulator

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

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7

Ohms Law

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

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8

Copper

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

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9

Circuit

________: A closed path that electric current follows.

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10

Protons

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

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11

electrolyte

The ________ enables charges to move from one electrode to the other.

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12

transfer of electrons

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

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13

Electric current

________ loses energy as it moves through the filament because the filament resists the flow of electrons.

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14

electric resistance

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

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15

Static Electricity

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

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16

Parallel Circuits

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

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17

Electric Power

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

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18

wet cell battery

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

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19

electrolyte

The ________ is a moist paste containing several chemicals.

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20

Voltage difference

________ is measured in volts.

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21

Electric current

________ is measured in amperes.

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22

Series Circuit

________: Current has only one loop to flow through.

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23

Circuits

________ also include conductors such as wires that connect the devices to the source of voltage difference to form a closed path.

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24

Voltage Difference

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

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25

Static Electricity

The accumulation of excess electric charge on an object

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26

Law of Conservation of Charge

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

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27

Conductor

A material in which electrons are able to move easily

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28

Insulator

A material in which electrons are not able to move easily

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29

Charging By Contact

The process of transferring charge by touching or rubbing

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30

Charging By Induction

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

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31

Electric Current

The net movement of electric charges in a single direction

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32

Voltage Difference

related to the force that causes electric charges to flow

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33

Circuit

A closed path that electric current follows

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34

Series Circuit

Current has only one loop to flow through

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35

Series circuits are used in flash

lights and some holiday lights

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36

Parallel Circuits

contain two or more branches for current to move through

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37

Electric Power

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

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