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TLHS Phy Sci Unit 8

Electricity & Magnetism

TermDefinition
static electricity accumulation of excess electric charge on an object
law of conservation of charge charges can be transferred but not created or destroyed
electric field surrounds every electric charge and exerts the force that causes other charges to be attracted or repelled
conductor material through which electrons move easily
insulator material in which electrons are not able to move easily
charging by contact process of transferring electrons by touching or rubbing
charging by induction rearrangement of electrons on a neutral object by a nearby charged object - they do not have to touch
electric current net movement of electric charges in a single direction, high voltage to low voltage
voltage difference force that causes electric charges to flow
V Volts, unit for voltage difference
electric circuit closed path that electric current follows
current direction positive charges flow
resistance tendency for a material to resist the flow of electrons
ohms unit of resistance
l = V/R equation for current (Ohm's Law)
A Amperes, unit of current
series circuit electric charges have only one path of travel
parallel circuit electric charges have more than one path of travel
magnetism properties and interactions of magnets
magnetic field region of space that surround a magnet and exerts a force on other magnetic materials
magnetic poles regions of a magnet that exert the strongest force
earth's magnetic poles defined by the end of the magnet that points to the north or south pole
magnetic domains groups with atoms aligned magnetic poles
electromagnetic force attractive or repulsive force between electric charges and magnets
electromagnetism interactions between magnets and electric charges
solenoid single wire wrapped into a cylindrical coil
electromagnet temporary magnet created when there is a current in a wire coil
electromagnet induction creating an electric current by changing a magnetic field
generator uses electromagnetic induction to transform mechanical energy into electrical energy
turbine large wheel that is turned and is used to capture mechanical energy
direct current electric current is always flowing in one direction through a wire
alternating current electric current reverses the direction in a regular pattern
transformer increases or decreases voltage of an alternating current