An electrical Charge is the physical property of matter that causes a force when placed in an electromagnetic field.

Placing aluminum foil in a microwave causes an electrical charge.

An electrical current is the rate of flow of electric charge past a point or region.

When you get shocked by an outlet you can feel an electric current pass through your body.

An electrical circuit is a device that allows a electrical current to flow through a path.

When there's an overload on a electric circuit it causes a fuse to blow.

Conductors of electricity are objects or materials that allow the flow of charge in one or more directions.

Glass is a conductor of heat.

An electrical insulator is a material in which the electron does not flow freely.

Mica blocks are used as electrical insulators in electronic equipment.

An insulator is a substance which does not readily allow the passage of heat or sound.

Plastics, styrofoam and rubber are all insulators.

Incomplete circuit vs Complete circuit:

An incomplete circuit is a circuit where a path is interrupted or "opened" at some point so that current will not flow

A complete circuit is a complete loop with electricity flowing the way it's supposed to flow: 

Series and parallel Circuits:

In a series circuit the voltages consumed by each individual resistance is equal to the source volt.

In a parallel circuit the voltage across each of the components is the same.