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# Science ch.7

charging by contact process of transferring charge between objects by touching or rubbing
charging by induction process of transferring charge between objects by bringing a charged object by a neutral object
circuit CLOSED conducting loop through which an electric current can flow
conductor material such as copper wire through which an excess of electrons can move easily
electric current flow of electric charge through a wire or any conductor; measured in Amperes (A-amps)
electrical power rate at which electrical energy is converted to another form of energy; expressed in Watts (W)
Insulator material that does not allow electrons to move through easily
Kilowatt-hour unit of electrical energy which is 1000 watts of power used for one hour
law of conservation of change states that charge can be transferred from one object to another but cannot be created or dedstroyed
ohm's law states that the current in a circuit equals the voltage difference divided by the resistance
resistance tendency for a material to oppose electron flow and change electrical energy and light
parallel circuit a circuit in which electric current has more than one path to flow
series circuit circuit in which electric current has only one path to follow
static electricity electricity generated when 2 objects rub against each other and result in the accumulation of excess electric charges on an object
voltage difference push that causes electrical charges to flow through a conductor measured in volts (V)
Be able to draw electric and parallel circuits Be able to draw electric and parallel circuits
Formula for calculating power Power=current (times) voltage difference P=IV
Formula for calculating energy Energy=power (times) time E=PT
protons have____ charges and electrons have _____ charges positive; negative
How do atoms become charged? by gaining or loosing electrons
What happens in most atoms? the charges of the protons an electrons cancel each other out and the atom has no net charge
opposite charges____ and like charges ____ attract;repel
what do electrons move easily through? conductors such as metals
what don't electrons move easily through? insulators such as plastic, wood, rubber, and glass
What is an example of charging by contact? static electricity from your feet rubbing the carpet
static discharge a transfer of charge through the air between 2 objects because of a buildup of static electricity ex. lightning
grounding using a conductor to direct an electric charge into the ground
How can you detect the presence of electric charges? by using an electroscope
how many loops does a series circuit have? one ex. christmaslights
What is possible with a parallel circuit? individual parts can be turned off without affecting the entire circuit
electric fuse contains a small piece of metal that melts if the current becomes to high, opening the circuit and stopping the flow of electricity
circuit breakers contain a small piece of metal that bends when it gets to hot, opening the circuit and stopping the current
What is electrical power expressed in? Watts
Created by: ChloeMJ