A battery is a device that stores chemical energy and makes it available in an electrical form. Many objects that we use every day require batteries to work. For example, TV remotes, iPads/phones, and some toys require batteries to operate. A battery is the source of power needed to make objects work properly.

In a complete circuit, electricity flows from the battery, to the device, and back to the battery again. A complete circuit does not have a beginning or an end. The energy in a complete circuit is constantly moving in the same direction.

A conductor of electricity is a material that allows electrons to flow freely from particle to particle which results in the conductor having a charge. Metals, iron, and copper are three popular conductors of electricity.

The electrical charge of an atom is what forms an atom. There are two types of electric charge: positive and negative. An atom will have a positive charge if there are more protons than electrons. An atom will have a negative charge if there are more electrons than protons.

Electric circuits are the path of transmitting electric currents or moving electricity. An electric circuit must be connected in all parts. The electrical circuit needs a power source, wires for electricity to flow through, and a device that uses the electric current.

An electric current is the movement of electric charges from one place to another in the circuit. The electric current is the path that the charges take through conductors that are part of a closed circuit.

An incomplete circuit is also known as an open circuit. An incomplete circuit has a beginning and an endpoint, in other words, they are not fully connected throughout. Incomplete circuits do not allow electricity to flow.

An insulator is any material that is a poor conductor of electricity. Insulators resist the flow of energy. Popular items that are used for insulators are: plastic, rubber, wood, and glass.