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TLHS Phy Sci #7
Electricity & Magnetism
Term | Definition |
---|---|
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 |