Chapter 13: Electricity
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Last updated 3:11 AM on 4/15/23
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46 Terms
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Ohms Law
________: the current in a circuit equals the voltage difference divided by the resistance.
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Atoms
________ contain particles called protons, neutrons, and electrons.
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Resistance
________: the tendency of a material to oppose the flow of electrons, changing electrical energy into thermal energy and light.
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Metal Wire
In a(n) ________, or any material, electrons are in constant motion in all directions.
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Electrons
________ are bound more tightly to some atoms and molecules.
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Cell
A(n) ________ consists of two electrodes surrounded by a material called an electrolyte.
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Battery
A(n) ________ can provide the voltage difference that is needed to keep current flowing in a circuit.
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Electrical Conductors
________ have much less resistance than insulators.
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Insulator
________: A material in which electrons are not able to move easily.
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negative charges
Positive and ________ exert forces on each other.
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Copper
________ is an excellent conductor and has low resistance to the flow of electrons.
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parallel circuits
In ________, the current follows more than one path.
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Chemical Reactions
________ in batteries produce a voltage difference between the positive and negative terminals.
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Circuit
________: A closed path that electric current follows.
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Plastic
The ________ coating around wires is an insulator.
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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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Protons
________ have positive electric charge and electrons have negative electric charge.
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Series Circuit
A(n) ________ provides only one path for the current to follow.
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Transfer of Electrons
Rubbing two materials together can result in a(n) ________.
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Electric Resistance
The ________ of most materials usually increases as the temperature of the material increases.
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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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Presence of Electric Charges
The ________ can be detected by an electroscope.
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Static Electricity
________: The accumulation of excess electric charge on an object.
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Voltage Difference
________: related to the force that causes electric charges to flow.
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Electric Current
________ is measured in amperes.
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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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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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Wet - Cell Battery
A(n) ________ contains several wet cells connected together.
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Earth
________ is a large, neutral object that is also a conductor of charge.
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Voltage Difference
________ is measured in volts.
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Series Circuits
________ are used in flashlights and some holiday lights.
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Parallel Circuit
________: contain two or more branches for current to move through.
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Cell
The ________ is called a dry ________ because the electrolyte is a moist paste, not a liquid solution.
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Series Circuit
________: the current has only one loop to flow through.
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Static Electricity
The accumulation of excess electric charge on an object
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Law of Conservation of Charge
Charge can be transferred from object to object, but it cannot be created or destroyed
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Conductor
A material in which electrons are able to move easily
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Insulator
A material in which electrons are not able to move easily
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Charging by Contact
The process of transferring charge by touching or rubbing
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Charging by Induction
The rearrangement of electrons on a neutral object caused by a nearby charged object
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Electric Current
The net movement of electric charges in a single direction
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Circuit
A closed path that electric current follows
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Resistance
the tendency of a material to oppose the flow of electrons, changing electrical energy into thermal energy and light
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Ohms Law
the current in a circuit equals the voltage difference divided by the resistance
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Parallel Circuit
contain two or more branches for current to move through
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Electrical Power
The rate at which electrical energy is converted to another form of energy
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