ch 20 science
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Created by:
becastle13 on April 12, 2011
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37 terms
Terms | Definitions |
|---|---|
 static electricity | buildup and discharge of electrons |
| electric field | area around particle where charge is detectable |
| proton | positively charged atoms |
| electron | negatively charged atoms |
| law of static charges | like repel, opposites attract |
| static discharge | release or loss of static charge |
| friction | rubbing 2 different materials together |
| induction | passing electrons without contact |
| conduction | passing charges through a conducting material |
| friction, conduction, induction | 3 ways of transferring electrons |
| lightening | atmospheric static discharge |
| thunder | airs rapid expansion due to lightening's super-heating |
| 5 miled per sec | determining lightenings distance |
| electroscope | used to detect lightening, not type of charge |
| electricity | flow of electrons through a conduction circuit |
| electrical potential | potential energy per election |
| potential difference | difference in energy between 2 places |
| voltage | unit of potential difference |
| V | symbol of voltage |
| voltage source | creates a potential difference in a circuit |
| resistance to electron flow | affects amount of current flow |
| I | symbol of current |
| Ω | symbol for OHM |
| OHMS | unit of resistance |
| Greg Ohm | who named the unit of resistance after his name |
| OHM's law | relates resistance, voltage and current |
| R=V/I | OHM's law (equations) |
| series circuit | only path for electron flow |
| parallel circuit | multiple paths for electron flow |
| short circuit | allows electrons to take an unintended path |
| resisting current | preventing current flow |
| grounding | current goes into ground if shorted |
| lightening rods | discovered by b. Franklin, ground lightening |
| Benjamin Franklin | who invented the lightening rods |
| benjamin franklin | who discovered static charges |
| circuit breakers | protect circuits from over load |
| fuse | thin wire which opens when circuit is over heated |
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