| A | B |
|---|
| q | Formula symbol for charge |
| I | formula symbol for current |
| t | Formula symbol for time |
| ampere | unit for current |
| coulomb | unit for charge |
| direct current | charge flows in one direction |
| alternating current | charge changes direction |
| 60 cycles per second | 60 Hertz |
| ammeter | measures current |
| voltmeter | measures voltage |
| frequency | number of repititions per unit time |
| period | time required for one event to occur |
| oscilloscope | instrument used to display electrical signals |
| heat | generated when electricity flows through a wire |
| circuit panel | limits electricity to a building |
| circuit breaker | bimetal strip bends opening overloaded circuit |
