| Term | Definition |
| Circuit | a closed path for electric current consisting usually of a voltage source, wires and lights that are powered by the current. |
| Series Circuit | the devices are connected so that the same current flows through each device |
| Parallel Circuit | the devices are connected in parallel so that the same voltage is applied across each device. |
| Circuit Breakers | open a circuit and stop the current if it exceeds some particular value. |
| Short Circuit | when a path of very low resistance appears between the terminals of a voltage source. |