| A | B |
|---|
| pole | the current -carrying moveable part or parts of a switch that closes and opens an electrical circuit |
| contacts | the current-carrying part of a switch that closes and opens an electrical circuit |
| SPST | Single Pole Single Throw switch |
| SPST | switch with two terminals used to connect one terminal to the other terminal |
| DPST | Double Pole Single Throw switch |
| DPST | a switch with four terminals used to connect one pair of terminals to the other pair of terminals. |
| SPDT | Single Pole Double Throw switch |
| SPDT | switch with three terminals used to connect one terminal to another |
| DPDT | Double Pole Double Throw switch |
| DPDT | a switch with six terminals used to connect one pair of terminals to either of the other two pairs. |
| PBNO | PushButton Normally Open |
| PBNO | switch whose terminals are connected with its pushbutton is depressed. |
| PBNC | PushButton Normally Closed |
| PBNC | switch whoe terminals are connected when its pushbutton is not depressed |
| ohm's law formula | E =IR |
| ohm's law | In any dc electric circuit, the current is directly proportional to the voltage and inversely proportional to the resistance. |
| voltage drop | the amount of voltage across any resistor in a circuit |
| IR drop | voltage drop |
| series string | a combination of two or more resistances in a series |
| parallel circuit | a circuit with two or more components connected across one voltage source. |
