| A | B |
|---|
| Circuit | closed conducting circle or loop through which current can flow |
| Closed (complete or working) circuit | the path through which an electric current can flow |
| Electric current | the flow of electricity through a conductor |
| Electrical energy | – energy that is absorbed or delivered by an electric circuit |
| Energy | ability to do work |
| Light Energy | Form of energy which our eyes can detect |
| Mechanical Energy | energy of motion |
| Medium | Matter that light travels through |
| Open (incomplete or broken circuit) | path through which an electric current cannot flow |
| Reflection | bouncing back of light rays from a surface |
| Refraction | bending of light as it moves through one medium into another |
| Sound energy | energy produced by vibrations |
| Thermal energy | energy related to the temperature of an object or a substance |
