| A | B |
|---|
| ampere | unit for electrical current (A) |
| amplitude | distance from the rest position to either the crest or trough of a wave |
| compression wave | type of wave where matter vibrates in the same direction as the wave travels |
| crest | highest point of a transverse wave |
| electric circuit | closed path through which electrons flow |
| electrical current | flow of electric charge through a conductor; measured in amperes |
| electromagnetic spectrum | transverse waves that transfer energy by radiation; vary in length from longest to shortest |
| empty space (vacuum) | space that contains no matter |
| frequency | measured in hertz (Hz); number of wave crests that pass a given point in one second |
| magnetism | force of attraction or repulsion in some materials between unlike and like poles |
| medium | solid, liquid, or gas through which a wave travels |
| Ohm's Law | potential difference = current times resistance; V = I x R |
| ohm | unit for resistance (Ω) |
| potential difference (voltage) | difference in electric potential; measured in volts with a voltmeter |
| reflection | when a wave strikes a surface and bounces off |
| refraction | bending of waves caused by a change of speed when passing from one type of medium to another |
| resistance | opposition to the flow of electrons through a conductor; measured in ohms |
| resistor | device that opposes the flow of electrons in a circuit; causes resistance |
| static electricity | build up of charge on the outside of an object when electrons move from one thing to another |
| transverse wave | type of wave where the medium moves at right angles to the direction of the wave |
| volt | unit for voltage (V) |
| wave | rhythmic disturbance that carries energy through matter or space |
| wavelength | distance between two adjacent, identical points on a wave |
