1)AN ELECTRIC CIRCUIT

An electric circuit is a pathway for the flow of electrons. If consits of the following parts, which are connected by wires: A generator that provides energy, elements that provide control and protection; loads that receive and use energy.
Electric current is a continous flow of electrons through a circuit.

PARTS OF AN ELECTRIC CIRCUIT

• Generators provide the energy that electrons need ir order to move.
• Loads are devices that transform electrical energy into other types of energy that we can use.

• Switching devices are used to direct and interrupt the flow of electric current.
  

DIAGRAMS AND SYMBOLS

We use a system of conventional symbols to simplify the visual representation of electric and electronic circuits, making them easier to understand.
The following table list the most common symbols:

UNIT 4 ELECTRIC CIRCUITS AND ELECTRONICS

Hello! Today we are going to start a new unit about electric circuits and electronics. In this unit you will learn to:

• Identify basic electrical and electronic components and their symbols.
• Use basic instruments and units of measurements for electricity.
• Design and build simple electric and electronic circuits.
• Draw circuit diagrams using the correct symbols.
• Explain various effects of electric circuit and how it is converted.
• Design and build a model car that is powered and controlled by electrical devices.