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Electricity
Chapter 20 7th Grade
23
Science
7th Grade
10/28/2013

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Term
proton
Definition
atomic particle with a positive electric charge
Term
electron
Definition
atomic particle with a negative electric charge
Term
neutron
Definition
atomic particle with neither a negative nor a positive electric charge
Term
static electricity
Definition
buildup of electric charges in an object
Term
electrochemical cell
Definition
device that changes chemical energy to electrical energy
Term
battery
Definition
a series of electrochemical cells that are connected to each other
Term
electrolyte
Definition
substance that forms ions when melted or dissolved in water
Term
conductor
Definition
material through which electric charge can flow easily
Term
insulator
Definition
material through which electric charge does not flow easily
Term
electric current
Definition
flow of electric charge through a conductor
Term
direct current
Definition
current in which electrons always flow in the same direction
Term
alternating current
Definition
current in which electrons constantly change direction at a regular rate
Term
electric current
Definition
path that an electric current follows
Term
series circuit
Definition
circuit in which electric current follows only one path
Term
parallel circuit
Definition
circuit in which an electric current can follow more than one path
Term
voltage
Definition
energy available to move charges through a circuit
Term
volt
Definition
unit used to measure voltage
Term
ampere
Definition
unit used to measure electric current
Term
resistance
Definition
opposition to the flow of electric current
Term
ohm
Definition
unit used to measure resistance
Term
Ohm's law
Definition
current in a wire is equal to the voltage divided by the resistance
Term
fuse
Definition
thin piece of metal that melts and breaks a circuit if too much current is flowing
Term
circuit breaker
Definition
switch that opens a circuit if too much current is flowing
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