A circuit in which there is only one path connecting the electrical components; electric current can flow along only one path. If one component of the circuit fails, the circuit is no longer closed and current cannot flow.

A device that consists of a conductor with a low melting point.

Anything that slows down the flow of electric charges: measured in ohms: a property of electricity.

The flow of electrons through a circuit: measured in amps (amperes); a property of electricity.

A circuit with more than one closed path connecting the electrical components; Electric current can flow along more than one path. If a component in one path fails, current can still flow in the other paths.

Materials that do not conduct heat or electricity well and do not allow it to flow (plastic, glass, and wood).

A reusable device that protects a circuit from becoming overloaded with excessive current.

The force of electricity that flows through a circuit: measured in volts; A property of electricity.

A path for electric current to flow with very low resistance. As a result, a high amount of current flaws, the wires get very hot and can melt. Enough heat can be produced to cause a fire.

Materials that transmit heat or electricity, allowing it to flow (most metals).

An electrical circuit that can be traced in a continuous path from the source of electrical energy (battery), around the circuit, and back to the energy source (when the light is on).