| A | B |
|---|
| voltage source | battery or generator |
| conductor | wire or printed circuit |
| control element | switch |
| electrical load | common users of electricity |
| alternating current or direct current | two types of electricity |
| battery | is made up of two or more cells. Used by voltage |
| Dry Cell Battery | Uses a paste material that contains the chemical that produces the voltage |
| Wet Cell Battery | contains a liquid electrolyte - usually a stong acid |
| How is a battery charged? | hooked up with some other voltage source |
| Cathode | negative electrode |
| Anode | positive electrode |
| Frequency | rate of change is a AC current |
| Hertz | cycles per second |
| Atom | the nucleus contains most of the atomic mass in the form of neutrons and protons |
| Protons | positive charge |
| Neutrons | neutral or no charge |
| Voltmeter | instrucment that measures voltage difference |
