• Axle : A pin or shaft on which a wheel rotates.

• Battery : A device used for generating electricity through a electrochemical reaction; a battery unit is often referred to as a cell.

• Battery holder : A manufactured device which holds a battery.

• Bulb holder : A manufactured device which holds a bulb.

• Cell : A cell is made of a positive electrode, a negative electrode surrounded by an electrolyte that acts chemically upon them, releasing electrons (generating electricity), a group of such cells connected together is called a battery.

• Challenge statement : In a problem solving science activity, the initial statement of what the final product will accomplish.

• Coroplast : Corrugated sheet of plastic similar in structure to cardboard.

• Circuit : A complete path of an electric current.

• Circuit breaker : Used as a safety device instead of fuses in buildings; used to prevent circuits in houses and buildings from being overloaded.

• Closed circuit : Where the current flows from the battery through an electrical appliance, providing power, and returning back to the battery.

• Conductor : Anything an electrical current can pass through easily.

• Contact points : Points or places on bells, bulbs and other electrical devices where wires are connected to allow for the flow of electricity.

• Double switch : When two switches work together to accomplish a task (e.g.traffic lights).

• Electric current : Flow of electricity through a conductor or transmitter.

• Electrical device : Anything that uses electricity or batteries. See a couple of Lego Logo Images, then go visit lego.com!

• Electricity : A type of energy made when small particles called electrons move from one object to another, there are two types - static and current.

• Electron : A highly mobile particle in an atom; negatively charged.

• Fuse : A safety device which prevents appliances from being ruined (or causing a fire) when circuits are overloaded; a thin strip of metal located within the fuse will burn up if a large electric current goes through it causing a break in the circuit and the subsequent "shutting down" of the device.

• Insulated wire : Wire coated with a plastic covering.

• Negative terminal : The point on the battery where electrons are lost.

• Open circuit : An incomplete circuit; the flow of electricity is stopped by a break in the circuit.

• Parallel circuit : Circuit in which two or more electrical devices, such as bulbs, are connected so that electricity can flow through each independent of the others. Since each device has its own circuit, equal amounts of electricity reach all devices and each device can be controlled without affecting the others.

• Positive terminal : The point on the battery where electrons are gained.

• Resistor : A device used in an electric circuit for protection, operation or current control; it SLOWS the electron flow (electric current).

• Schematic diagram : A method of diagramming using interconnected symbols, each symbol representing an electrical component.

• Series Circuit : One in which the current has only one path to take from the negative terminal of the battery through the electrical devices and back to the positive terminal; the circuit no longer works if one bulb or battery is disconnected.

• Simple circuit : A circuit with only one electrical device connected to a battery.

• Switch : A device used to control the flow of electricity, having two mates: on or closed and off or open.

• Troubleshoot : To detect and correct flaws in design or construction of a device to ensure success in project design or proper functioning of an already manufactured device.

• Two-way switch : A switch which controls the flow of electricity from either of two points.

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