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47 Cards in this Set

  • Front
  • Back
amp
the unit used to measure electric current
amplitude
a measure of how hard air molecules push on other molecules next to them as a sound wave passes through the air
circuit
a complete path of conductors that an electric current can flow through
circuit breaker
a switch that automatically opens a circuit when too much electricity passes through it
colloid
a special type of mixture in which the particles of one material are scattered through another and block the passage of light
compression
an area in a sound wave where air molecules are pressed together
concave lens
a lens that is thinner in the center and thicker at the edges; it bends light outward
conductor
a material that allows heat energy or electricity to pass through easily
convex lens
a lens that is thicker in the middle and thinner at the edges; it bends light inward
decibel
the unit used to measure the loudness of a sound
dry cell
a device that uses chemicals to produce electricity; a battery
electric circuit
a constant flow of electrons through a conductor
electric charge
the movement of electrons; can be a positive or negative charge
electricity
a form of energy that is produces when electrons move from one place to another
electromagnet
a temporary magnet created by a flow of an electric current around an iron bar
electromagnet spectrum
a group of waves, including light which can travel through space
filament
a thin wire that glows in some kinds of light bulbs
focal point
the point where light rays come together after passing through a lens
frequency
the number of waves that move past a point in a certain amount of time
fuse
a device that prevents fires by melting when too much electricity flows through a circuit
light
a form of energy that travels in waves and can move through empty space where there is no air
magnet
an object that attracts iron and a few other magnetic materials like steel
magnetic field
the area around a magnet where the force of magnetism can be felt
magnetism
a force that pulls magnetic materials across a distance
magnifier
a tool with a lens that makes things look bigger so you can see them more clearly
motor
a device that uses electricity to produce motion
opaque
a substance that completely blocks light from passing through it
parallel circuit
an electric circuit in which each device has its own separate loop
pitch
how high or low a sound is
prism
a glass bar that separates white light into the colors of the rainbow
rarefaction
an area in a sound wave where air molecules are spread out
reflection
the bouncing back of light rays from a surface
refraction
the bending of light rays as they pass through a material
resistor
a device in a current that slows the electric current but does not stop it
series circuit
an electric circuit in which the devices are connected in one continuous loop
solar
a device that changes solar energy to electric energy
sound
a form of energy produced by vibrating objects
static electricity
the buildup of electric charges on an object
switch
a device that opens and closes an electric circuit to stop and start the flow of electrons
transparent
allows all light to get through; the objects can be seen clearly
vibration
a rapid back and forth movement that produces sound
visible light
electromagnetic waves that you can see
volt
the unit to measure the push of electrons in a circuit
voltage
the push that makes an electric current move through the circuit
wavelength
the distance between one wave and the next wave
lens
a curved piece of glass that bends light rays
insulator
a material that does not let heat energy or light pass through it easily