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Basic Electrical Symbols and Their Meanings

> Electrical Diagram Symbols > Basic Electrical Symbols and Their Meanings
Posted by Daniel Belisario | 08/18/2020
Basic electrical symbols contain earth electrode, cell, battery, resistor, etc. Whether you are a novice or a professional engineer, these basic symbols can help create accurate circuit diagrams in minutes.

You can depict a complex electrical circuit with the standard and simplified electrical symbols. Therefore, anyone who knows of electrical and electronic circuits can read, understand, and build quickly.

Basic Electrical Symbols

Basic Electrical Symbols

Symbols can be found in Edraw Symbol Library

Earth electrode Earth electrode is a metal plate or other conducting elements of electricity partially buried in the earth to constitute and provide a reliable conductive path for the fault current to the ground.
Cell Cell is a device containing electrodes immersed in an electrolyte, used for generating current or for electrolysis.
Battery Battery is a container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
Source Source is a part of a field-effect transistor from which carriers flow into the inter-electrode channel.
Ideal source Ideal source includes an ideal voltage source and ideal current source. An ideal source is a theoretical concept of an electrical current or voltage supply (such as a battery) with no losses and a perfect voltage or current supply. Ideal sources are used for analytical purposes because they cannot occur in nature.
Resistor Resistor is a device that has resistance to the passage of an electric current.
Capacitor Capacitor is a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.
Antenna Antenna is an electrical device which converts electric power into radio waves and vice versa.

Some most commonly-used basic electrical symbols in schematic diagrams are shown below:

Most Commonly Used Basic Electrical Symbols

Let's take a look at how to use the basic electrical symbols to draw a schematic diagram of the circuit and its components.

Example one: There are three D-cells placed in a battery pack to power a circuit containing three light bulbs. The resistor symbol represents each light bulb. The connecting lines are used to connect the symbols. At the same time, don't forget to put the switch in the circuit to control the current flow. The final sketch is shown in the following picture.

Electrical Circuit Example One

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Switches and Relays Symbols

The picture below shows switches symbols. Switch 1P, isolator 1P, circuit breaker 1P, SPST, SPDT, DPST, DPDT, and more symbols are available in Edraw Max.

Basic Electrical Symbols - Switches and Relays

Symbols can be found in Edraw Symbol Library

Switch Switch is a device for making and breaking the connection in an electric circuit.
Isolator Isolator is a mechanical switch that isolates a part of a circuit from the system as when required. Electrical isolators separate a part of the system from rest for safe maintenance works.
SPST SPST is a single-pole, single-throw (SPST) switch.
SPDT SPDT is single-pole, double-throw (SPDT) switch.
dpst DPST is double-pole, single-throw(DPDT) switch.
DPDT DPDT is a double-pole, double-throw (DPDT) switch.

As you can see from the above pictures, using electrical symbols to draw an electrical circuit diagram is quite easy. To illustrate the method, we will give you another example of using the basic electrical symbols.

Example two: Three D-cells are placed in a battery pack to power a circuit containing three light bulbs. Firstly, quickly figure out which electrical symbol shall be used in the diagram. Then, think about the layout of these symbols. Last but not least, use a connector tool to connect all the electrical symbols.

Electrical Circuit Example Two

Using the basic electrical symbols to draw a circuit diagram can show the manners in which the circuit components are placed. With the complete electrical schematic, you can read the picture to know the physical connections and layout of an electric circuit.

Transmission Path Symbols

The picture below shows the transmission path symbols like wire, multi-line bus, straight bus, junction, terminal, test point, label, outward flow, inward flow, etc.

Basic Electrical Symbols - Transmission Path

Symbols can be found in Edraw Symbol Library

Wire Wire is used to connect the components in a circuit.
Test point Test point is a location within an electronic circuit used to either monitor the state of the circuitry or inject test signals.
Outward flow Outward flow means flowing outwardly.
Inward flow Inward flow means flowing inwardly.

The basic electrical symbols are used to simplify the drafting and to help people understand the electrical drawing. Electrical symbols are standardized throughout the industry, so it is easy to achieve the ability to interpret the meaning of the symbols. With the standard electrical symbols in Edraw, you can create a circuit diagram that shows the actual layout of the components simply and quickly.

Semiconductor Devices

Basic Electrical Symbols - Semiconductor Devices

Symbols can be found in Edraw Symbol Library

Transistor PNP Transistor PNP is a semiconductor device provided with three terminals called base, emitter, and collector, which allows current flow when the low potential at the base (middle).
Transistor NPN Transistor NPN allows current flow when high potential at base (middle).
Diode Diode is a semiconductor device that allows the current to flow in one direction only.
Tube The electrical properties of a Tube are not substantially modified by the ionization of residual gas or vapor when there applies a high pressure.

How to Create a Circuit Diagram with Electrical Symbols

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