# Physics Test

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The flashcards below were created by user kellyd on FreezingBlue Flashcards.

1. Electricity
The flow of electrons from 1 atom to another
2. 3 Ways to make electricity flow
• Conductions - Metals
• Induction - Wire through magnetic field (generator)
• Friction - Static Electricity
3. Conductors
• Things that allow electricity to flow easily
• metals, water
4. Insulator
• Doesn't allow electricity to flow easily
• wood, glass, plastic, rubber
5. Semi-Conductor
Chnges from good conductors to good insulators under different conditions
6. Ohm's Law
V = IR
7. Voltage
The push behind current
8. Current
The flow of electrons
9. AC
• Alternating current
• Plugs
• Changes direction
10. DC
• Direct Current
• Batteries
• Only flows in 1 direction
11. Resistance
• Opposition to the flow of electrons
• Determines how easily current can flow through a circut
• Lightbulbs, ovens, resistors, hairdryers
12. Circut
A closed path where electricity can flow
13. Wave
A repeating disturbance that transfers energy through a matter or space
14. Transverse wave
• A wave that has a disturbance perpendicular to the disturbance of motion
• Ocean waves, rope, magnetic waves
15. Compressional / Longitudal Waves
• Waves that have a disturbance parallel to the direction of motion
16. Medium
• The matter of space that a wave moves through
• Electromagnetic waves do NOT need a medium to travel through
17. Parts of a wave
• Amplitude - The distance the disturbance is away from the equilibrium
• Wave length - The distance from crest to crest or trough to trough. One complete cycle
18. Velocity
• The speed with which a wave moves through a medium. Determined by the density of the medium.
• Solid - Fast
• Liquids - Medium
• Gasses - Slow
• If the medium does not change, all waves move at the same velocity
19. Frequency
Number of complete wave cycles per second (Hz)
20. Harmonics
A series of standing waves created by vibrating an object at its natural frequency
21. Constructive interference
Two waves combine to make a large wave (antinode)
22. Destructive Interference
When 2 waves combine to make a smaller (or no) wave (node - no wave)
23. Fundamental Frequency
1st Harmonic

### Card Set Information

 Author: kellyd ID: 154060 Filename: Physics Test Updated: 2012-05-16 01:37:10 Tags: Physics Folders: Description: Waves, Harmonics, Electricity Show Answers:

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