1. An electric circuit.

An electric circuit is a parthway for the flow of electrons, it consists of the following parts, which are connected by wires: a generator that provides energy, elements that provide conrol and protection; loads that receive and use energy.
Electric current is a continuous flow of electrons through a circuit.

1.1. Parts of an electric circuit.
Electric circuit consists of varoious parts:

• Generators.

-Cells and batteries.

• Loads. 

-Light bulbs: they produce light.
-Motors: they produce movement.
-Resistors: They produce heat.
-Bells: they produce sound.

• Switching devices.

-Switches.
-Push buttons.
-3-way switches.

1.2. Diagrams and symbols.