| A | B |
|---|
| repulsive force | two charges of like sign |
| attractive force | two charges of unlike signs |
| neutral object | equal amounts of positive & negative charges |
| electric force between objects | can be either attraction or repulsion |
| electric field lines around a negative charge | always point inward |
| unit potential difference is measured in | volts |
| batteries | have a positive & negative terminal |
| current (I) | rate at which charges move thru a conductor |
| brightness of a bulb is due to | resistance in the filament |
| SI unit for resistance | ohm |
| how easily charges move | depends on how tightly electrons are held |
| letter to represent current | I |
| letter to represent voltage | V |
| letter to represent resistance | R |
| letter to represent power | P |
| insulator | has high resistance |
| conductor | has low resistance |
| super conductor | has the least resistance |
| semiconductor | has less resistance than an insulator and more than a conductor |
| circuit breaker | a device to protect a circuit from overload |
