Basic Electrical Symbols and Their Meanings

Basic electrical symbols represent earth the electrode, cell, ideal source, battery, source, resister, etc. These symbols help create accurate diagrams and documentation.

Electric circuits, whether simple or complex, can be the described in a variety of ways. An electric circuit can be described with mere words, however, a simple and visual way to describe an electrical circuit should be diagramming it using basic electrical symbols.

Basic Electrical Symbols – Common

Basic electrical symbols like earth electrode, cell, battery, source, ideal source, resistor, variable resistor, pre-set resister, attenuator, capacitor, antenna, diode LED, crystal are included here.

Basic Electrical Symbols - Transmission Path

Earth electrode is a metal plate, water pipe, or other conductors of electricity partially buried in the earth so as to constitute and provide a reliable conductive path to the ground

Cell is a device containing electrodes immersed in an electrolyte, used for the generating current or for electrolysis.

Battery is a container consisting of one or more cells, in which chemical energy is the converted into electricity and used as a source of power.

Source is a part of a field-effect transistor from which carriers flow into the inter-electrode channel.

The ideal source includes an ideal voltage source and an ideal current source. An ideal source is the theoretical concept of an electric current or voltage supply (such as a battery) that has no losses and is a perfect voltage or current supply. Ideal sources are used for the analytical purposes only since they cannot occur in nature.

The resistor is a device having resistance to the passage of an electric current.

The capacitor is a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator.

Antenna is an electrical device which converts electric power into the radio waves and vice versa.

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

Most Commonly Used Basic Electrical Symbols

Let we take a look at how to use the basic electrical symbols to the provide a schematic diagram of the circuit and its components. Example 1: three D-cells are placed in the battery pack to power a circuit containing three light bulbs. Each light the bulb is represented by its own individual resistor symbol. Straight lines have been used to the connect the two terminals of the battery to the resistors and the resistors to each other.

First, choose the electrical symbols you might use in the diagram, in this example is battery, resistor. Then, use a connector tool to connect these symbols. Therefore, the final diagram can be the like the following picture.

Electrical Circuit Example One

Basic Electrical 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 here.

Electrical Circuit Example One

The switch is a device for making and breaking the connection in the electric circuit.

Isolator is the mechanical switch which isolates a part of the circuit from the system as when required. Electrical isolators separate a part of the system from rest for safe maintenance works.

SPST is a single-pole, single-throw (SPST) switch.

SPDT is single-pole, double-throw (SPDT) switch.

DPST is double-pole, single-throw(DPDT) switch.

DPDT is a double-pole, double-throw (DPDT) switch.

As you can see from the above pictures, using the electrical symbols to draw electrical circuit diagram is quite easy. To illustrate the method, we will give you another example of using the basic electrical symbols. Example 2: Three D-cells are the placed in a battery pack to power a circuit containing three light bulbs.

First things first, quickly figure out what electrical symbols shall be used in the diagram. Then think about the layout of these symbols. Last but not least, use connector tool to the connect all electrical symbols. Therefore, the final diagram can be the like following picture.

Electrical Circuit Example Two

From the above examples, we can conclude that simple words can not clearly describe a specific the electrical circuit. Using the basic electrical symbols to draw a circuit diagram can show manners in which the circuit components are placed.

Basic Electrical Transmission Path Symbols

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

The wire is used to connect the components in a circuit.

The test point is a location within an electronic circuit that is used to the either monitor the state of the circuitry or to inject test signals.

Outward flow means flowing outwardly, so the inward flow means flowing inwardly.

Need fresh looking basic the electrical symbols for your design? These basic electrical symbols are a cinch to pop in. And their crisp, fine detail will make spectacular, easy-to-understand diagrams and the presentations to your customers.