Electrical Schematic Reading Tutorial

By | September 29, 2022

Learn How To Read Electrical Schematic Diagrams

For any electrical engineer, being able to read electrical schematic diagrams is an essential skill. Understanding how to read electrical schematics is the key to mastering the craft of designing and building circuits. Without this knowledge, construction and debugging of electric circuits can be a tedious and difficult task.

Electrical schematic diagrams are used to represent complex electrical circuits. These diagrams show how components are connected within a circuit in a concise way. Reading these diagrams can be quite challenging, but with some practice and knowledge, it can be learned quite easily. This article provides an overview on how to read electrical schematics and use them to troubleshoot and build circuits.

Different Types of Electrical Schematic Diagrams

Electrical schematics come in different forms and types. Generally, they can be classified into three main categories: block diagrams, wiring diagrams, and connection diagrams. A block diagram is the most basic type of electrical schematic and is used to illustrate the relationship between parts of an electrical system without showing all the wiring details. Wiring diagrams are more detailed, and show how wires are connected between components. Connection diagrams, sometimes called schematic diagrams, provide a more complete view of the circuit, including all the details of each component and how they are wired together.

Interpreting Electrical Schematic Diagrams

When reading a schematic diagram, it is important to understand how each component is represented and how the circuit works. Each symbol on an electrical schematic diagram represents a part of the circuit along with its different properties. For example, resistors have a combination of two lines and a curved line, transistors have a triangle inside a circle, and capacitors have a curved line and two other lines. The purpose of each component is also indicated by number or letter codes.

Identifying Components and Connections

Once you understand how components are represented on a schematic diagram, you can start to identify the components and connections in the diagram. A good way to do this is to trace out the circuit from start to finish. This means following the flow of electricity from the battery to the device. As you trace out the circuit, you should identify which components are connected together and their corresponding values. This will help you understand how the circuit works.

Building and Troubleshooting Circuits

Once you’ve identified the parts and connections of a circuit, you can then start to build it or troubleshoot it. To build a circuit, you should refer to the schematic diagram and identify the components that need to be connected and where they should be connected. To troubleshoot a circuit, you should use a voltmeter to measure the voltage at each component and test the connections. This will help you identify any components that are not working correctly or any connections that may be broken.


Reading electrical schematic diagrams can be challenging, but with a bit of practice and knowledge it can be easily mastered. Once you know how to read a schematic diagram, you can identify components, understand how the circuit works, and use it to construct or troubleshoot circuits. Electrical schematic diagrams are widely used in the engineering world and having the ability to read and interpret them is an invaluable skill.