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 resistance | in physical science, the opposition presented to the current by a material or device |
| battery | a device that converts chemical energy to electrical energy |
| voltage | the potential difference between two points; measured in volts |
| Ohms | unit for resistance |
| volts | unit of measurement that indicates the force of electricity used or produced |
| electric current | the rate at which charges pass through a given point; measured in amperes |
| ampere | unit used to measure electric current |
| direct current | electric current that flows in only one direction |
| alternating current | electric current that changes its direction repeatedly |
| potential difference | the difference in electrical charge between two points in a circuit expressed in volts |
| cell | in electricity, a device that produces an electric current by converting chemical or radiant energy into elctrical energy |
| series circuit | a circuit in which the parts are joined one after another such that the current in each part is the same |
| parallel circuit | A circuit in which the parts are joined in branches such that the potential difference across each part is the same |
| resistor | component made of material that opposes flow of current and therefore has some value of resistance. |
| load | item along a circuit that convert electricity into other forms of energy |
| circuit diagram & symbols | a diagram with symbols that represent all of the components in a circuit and how they are connected. |
| magnetic field | the region around a magnet in which magnetic forces can act |
| magnetic field lines | lines that map out the magnetic field around a magnet |
| magnetic north | the pole of a magnet that points to the north |
| magnetic south | the pole of a magnet that points to the south |
| geographic north | the direction in which the top of the Earth's rotational axis points; also know as true north |
| geographic south | the direction in which the bottom of the Earth's rotational axis points |
| electromagnetism | the interaction between electricity and magnetism |
| electromagnet | a coil that has a soft iron core and that acts as a magnet when an electric current is in the coil |
| motor | a device used to convert electric energy into mechanical energy. |
| generator | a machine that changes mechanical energy into electrical energy |