# Physics Test

 Electricity The flow of electrons from 1 atom to another 3 Ways to make electricity flow Conductions - MetalsInduction - Wire through magnetic field (generator) Friction - Static Electricity Conductors Things that allow electricity to flow easilymetals, water Insulator Doesn't allow electricity to flow easilywood, glass, plastic, rubber Semi-Conductor Chnges from good conductors to good insulators under different conditions Ohm's Law V = IR Voltage The push behind current Current The flow of electrons AC Alternating current PlugsChanges direction DC Direct CurrentBatteries Only flows in 1 direction Resistance Opposition to the flow of electronsDetermines how easily current can flow through a circut Lightbulbs, ovens, resistors, hairdryers Circut A closed path where electricity can flow Wave A repeating disturbance that transfers energy through a matter or space Transverse wave A wave that has a disturbance perpendicular to the disturbance of motionOcean waves, rope, magnetic waves Compressional / Longitudal Waves Waves that have a disturbance parallel to the direction of motionSound waves, earthquakes, slinkey Medium The matter of space that a wave moves through Electromagnetic waves do NOT need a medium to travel through Parts of a wave Amplitude - The distance the disturbance is away from the equilibriumWave length - The distance from crest to crest or trough to trough. One complete cycle Velocity The speed with which a wave moves through a medium. Determined by the density of the medium. Solid - FastLiquids - MediumGasses - Slow If the medium does not change, all waves move at the same velocity Frequency Number of complete wave cycles per second (Hz) Harmonics A series of standing waves created by vibrating an object at its natural frequency Constructive interference Two waves combine to make a large wave (antinode) Destructive Interference When 2 waves combine to make a smaller (or no) wave (node - no wave) Fundamental Frequency 1st Harmonic Authorkellyd ID154060 Card SetPhysics Test DescriptionWaves, Harmonics, Electricity Updated2012-05-16T01:37:10Z Show Answers