pulse		transforms chemical energy into electrical energy. tries to maintain constant voltage
superposition		when objects with different charges touch, the charges are shared between the objects
phase		a single wave bump caused by a disturbance
in phase		the relative positions of the crests of two waves
out of phase		the ratio between two sound intensities
node		two equal charges of opposite sign
antinode		current that moves steadily in one direction
intensity		amount that cant be divided
sound level		flow of current from negative to positive
sound level b		study of charges at rest
ion		atom that has gained or lost a proton
static electricity		relative difference between the intensities of two sounds
conductors		current that reverses direction many times per second
insulators		the force of a charge that extends in all directions
semi-conductors		points of constructive interference in a standing wave
charging by conduction		a force acting at a distance
charging by induction		points of destructive interference in a standing wave
electrostatics		when the crests and troughs of two waves line up, causing constructive interference
field		long coil of wire consisting of many loops
electric field		potential energy of a test charge at a particular point in an electric field
electric field lines		conduct under some circumstances, insulate under other circumstances
electric diopole		the resulting amplitude when two waves meet is the sum of their individual amplitudes
elementary charge		indicate the direction and relative strength of electric fields
quantized		objects with different charges can affect each other when they are close but not touching
electric potential		force of a magnet that extends in all directions
battery		flow of current from positive to negative
conventional current		energy transported by a wave
electron flow		when the crests of one wave meet the troughs of the other causing destructive interference
DC current		ends of the magnets
AC current		allow electrons to move freely, loosely bounded to the atom
poles		the amount of charge for 1 electron
solenoid		build up of electric charge on the surface of an object
magnetic field		don't allow electrons to move freely, tightly bounded to the atom