| A | B |
|---|
| static electricity | Build up of negative charges |
| Electric fields | becomes weaker with distance |
| conductor | allows electrons to flow easily |
| electroscopes | device for detecting eletrical charges |
| Potential difference | electrons flow from hig areas of potential energy to low areas |
| Potentail difference measured in | volts (V) |
| measured by | voltmeter |
| circuit | closed path through which electrons flow |
| current | flow of elcetrons through wire or conductor |
| dry cell | one battery--2 or more in a series |
| dry cell made of | zinc, chemical paste, carbon rod |
| dry cell--negative end | zinc |
| dry cell--positive end | carbon rod |
| wet cell--use | car battery |
| wet cell | two plates made of different metal in an elctrolyte solution |
| Resistance | tendency of material to oppose flow of electrons |
| resistance measured in | Ohms |
| why is tungsten in filaments | cause of its resistance to current |
| how does size effect resistance | thick wire is less than thin wire |
| how does lenght effect resistance | short wire is less long is more |
| how does temp. relate to resistance | resistance increases as temp. increases |
| Potential difference formula | V= I x R |
| Electrical power | rate at which electric energy is converted to another form of energy |
| formula for power--unit watt | P= I x V or power= current times volts |
| electric energy formula--unit kilowatt hour | E=t x P |
| series circuit | circuit w/ 1 path for elcetrons |
| parallel circuit | mpore than 1 path for electrons to flow |
| fuses | device for preventing circuits from overloading wire melts |
| circuit breaker | a switch flips to turn off |
| current | Ampere (A) |
| electric power | W or kW |
| Electrical energy | kWh |
| resistance | Ohms |
