Before constructing a real circuit, it is first necessary to represent the circuit parts using schematic diagrams. Here are some of the most commonly used electrical elements and their respective schematic diagrams

An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit.

What you are expected to learn

At the end of this module, you should be able to:

• Understand why schematic symbols were developed.
• Explain how schematic symbols are used.
• Identify differences in symbols used in electrical wiring diagrams and electronic schematic diagrams.
• Describe how a reference designator is configured with schematic symbols.
• Discuss the purpose of a schematic diagram.
• Describe the difference between a block diagram and a schematic diagram.
• Explain the difference between an analog schematic diagram and a digital schematic diagram.
• List the techniques for making a schematic diagram.

How to learn from this module

Going through this module can be both a fun and a meaningful learning experience. All you need to do is make use of your time and resources efficiently. To do this, here are some

tips for you:

1. Take time in reading and understanding each lesson. It is better to be slow but sure than to hurry finishing the module only to find out that you missed the concepts you are supposed to learn.

2. Do not jump from one chapter to another. Usually, the lessons are arranged such that one is built upon another, hence an understanding of the first is essential in comprehending the succeeding lessons.

3. Be honest. When answering the test items, do not turn to the key to correction page unless you are done. Likewise, when performing experiments, record only what you have really observed.

4. Safety first. Perform the experiments with extra precaution. Wear safety gears whenever necessary.

5. Don’t hesitate to ask. If you need to clarify something, approach your teacher or any knowledgeable person.

What to do before (Pretest)

Identify each schematic symbol

• Schematic symbols are symbols used to represent electrical and electronic schematic diagrams.
• Schematic diagrams are used to show how a circuit is connected.
• Reference designators identify components in a schematic diagram.
• A block diagram represents how the component blocks of a circuit are connected.
• A schematic diagram shows how the components are connected in a circuit.
• Analog schematic diagrams show how the discrete analog components are connected.
• Digital schematic diagrams use integrated circuits and have many common signals throughout the schematic; therefore, they use common signals rather than draw every line.
• A good schematic diagram should show the entire circuit in as few drawings as possible.

• Two types of ground are earth and electrical.
• Earth grounding is used to prevent electric shock by keeping all appliances and equipment at the same potential.
• Electrical grounding provides a common reference point.

Circuit Diagram Simulation Activity

Schematic Diagram Symbols

Self Check