| A | B |
|---|
| electric charge | SI unit in coulombs (C) |
| like charges _______ | repel |
| north and South Poles would_____ | attract |
| force of attraction or repulsion between electrically charged objects | electric force |
| strength of an electric field depends on | amount of charge and distance from the charge |
| static electricity | a net charge that builds up on objects or moves from one object to another |
| How can charge be transferred? | friction,contact and induction |
| electrical conductor | a material that conducts a charge easily Ex. wire |
| electric insulator | wood, plastic, or rubber |
| resistance | opposition to the flow of charges in a material -measured in Ohms |
| Ohms Law | : voltage = current x resistance: 3 amps (I)X 3 ohms (R)= 9 volts |
| current | (I) amps |
| battery | device that converts chemical energy to electrical energy |
| series circuit | has only ONE path for current to follow |
| parallel | electrical path with more than one path; light burnout will not affect others |
| Power | (I) amps X (V) volts/ = Kwatts (joules per second) |
| Superconducter | material with zero esistance since its so cold it conducts electricity |
| Fuse | device that prevents overheating that shuts system down |
| circuit breaker | a switch that opens or closes the current |
| grounding | an extension wire to the earth to deliver excess current; electrical safety outlet |
| alternating current | a current that reverses its flow ;wiring in a house |
| voltage | a measure of potential difference (joules) |
| Calculation for POWER | Watts=amps x V (volts) |
| Fomula for energy used by appliance | Kilowatts= watts x time |
| direct current | current in only one direction; battery |
| interference with flow of electricity | length, thickness and high temperature increase resistancde |
