| A | B |
|---|
| energy | the ability to do work |
| stored energy | energy that can change later into a form that can do work |
| energy of motion | energy that moving objects have |
| conductor | a material through which energy flows easily |
| insulator | a material through which energy cannot flow easily |
| fuel | a material that is burned to produce useful heat |
| temperature | a measure of how hot a place or object is |
| thermostat | controls the temperature in a building |
| ray | a thin line of light |
| reflect | to bounce back |
| lens | a piece of material that bends light rays that pass through it |
| electric charges | tiny amounts of electricity present in all matter |
| electric current | the flow of electric charges |
| electric circuit | the path along which electric current moves |
| electromagnet | a metal that becomes a magnet when electricity passes through wire wrapped around it |
