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Electrical Symbols and Meanings

Sep 8, 2022

Electrical symbols diagram and electrical symbols charts created by engineers sometimes include the use of electrical and electrical circuit symbols and graphics to illustrate how the various components of a circuit are linked to one another.

Circuit layouts and electrical symbols drawings are a simple and effective technique for displaying the electrical connections, components, and functioning of a specific electrical circuit or system pictorially. 


Electrical circuit symbols, schematics, and computer-aided design software frequently use fundamental electrical and electronic graphical symbols known as electronic symbol charts to indicate the location of specific components and parts inside a circuit.

Not only can electrical symbols drawing indicate the location of a component, but they can also identify the kind of electrical element the component is, such as resistive, inductive, capacitive, mechanical, and so on. 


Electric Circuit

The components of an electric circuit are as follows: a device that supplies the charged particles that make up the current with energy, such as a generator or a battery; devices that make use of the current, such as electric motors, lamps, or computers; and the wires or transmission lines that connect the various components.

Ohm’s law and Kirchhoff’s rules are examples of fundamental laws that may be used to provide a mathematical description of the operation of electric circuits.


What is Electrical Energy? 

The supply of electrical energy, the first component in an electric circuit, makes it possible for electrons to move around. This source might be a battery, a solar cell, or a hydroelectric plant; it must be a location with a positive and a negative terminal, and it must be a place where the charge can flow from one terminal to the other. The force exerted by an electric charge is referred to as voltage, and its potential is expressed in volts.

Electric batteries should also be handled with care; never connect the two terminals of the battery without a bulb or a load because the chemicals inside the battery react so quickly that they generate an enormous amount of energy, which can even cause the batteries to burst if the connection is made without a load or a bulb.


The Device in the Electric Circuit

The gadget constitutes the second part of the whole. It acts in response to the electric current that is flowing through it. The definition of a gadget in today’s society is anything that can be used with electricity and can be inserted into a power socket. In most cases, a piece of conducting material is used to complete the circuit and seal the loop.

Although a wire is often used, various materials may also close the loop. For instance, the television includes several metal strips that have been put onto a surface made of plastic. This plastic may serve as the conducting material or, in certain instances, even the device’s chassis eventually becomes a part of the closed circuit.


Basic Properties of Electric Circuits

The basic properties of electric circuits include:

  • A closed route is always considered to be a circuit.
  • At least one energy source is always present in a circuit that also performs the function of an electron source.
  • A source of energy, either uncontrolled or regulated, resistors, capacitors, inductors, and other components are all considered to be electric elements.
  • The flow of electrons in an electric circuit goes from the terminal with the negative charge to the terminal with the positive charge.
  • The direction of flow of conventional current is from a positive to a negative terminal.
  • The passage of current leads to a possible drop across the different constituents.

Electrical symbols and meanings

Electrical circuit symbolsElectrical schematic symbolsElectrical symbols and meanings
Electrical symbolsSingle CellA solitary 0.5-volt direct current battery cell
Electrical symbolsD.C. Voltage SourceA source of continuous D.C. voltage with a predetermined voltage.
Electrical symbolsD.C. Battery SupplyA group of individual cells together make up a direct current battery supply.
Electrical symbolsControlled Voltage SourceA voltage source that is reliant on another voltage or current and is controlled by it externally.
Electrical symbolsDC Current SourceA supply of direct current that is constant and of a set value.
Electrical symbolsVariable CapacitorA variable capacitor whose capacitance value may be altered by using plates that can be adjusted in their position.
Electrical symbolsOpen InductorWhen it is energised, an open inductor, coil, or solenoid that produces a magnetic field around itself is referred to as a transformer.
Electrical symbolsFerrite Core InductorAs seen by the dashed lines, an inductor is created by wrapping the coil around a spherical, non-solid ferrite core.
Electrical symbolsIron Core InductorAn inductor is created by wrapping the coil around a solid laminated iron core, as seen by solid lines.
Electrical symbolsSPDT Changeover SwitchA changeover switch with a single pole and two throws is used for switching the direction of current flow from one terminal to another.
Electrical symbolsSPST Toggle SwitchThe toggle switch has a single pole and one throw that may either complete or interrupt the flow of electricity via a circuit.
Electrical symbolsPushbutton Switch (N.O)Press-button switch with normally open contacts; push to shut, release to open
Electrical symbolsSPST Relay ContactsAn electromechanical relay has an internal toggle contact configuration that is single-pole, single-throw.
Electrical symbolsLight Emitting Diode (LED)When subjected to forward bias, a semiconductor diode causes the emission of coloured light from its junction.
Electrical symbols7-segment DisplayFor the display of individual numerals and letters, a 7-segment display will either employ a common cathode (CC) or a common anode (C.A.).
Electrical symbolsPhotoresistorA light-dependent resistor (LDR) is a resistor whose value varies in response to the amount of light hitting it.
Electrical symbolsSolar CellP-N junction photovoltaic cells are the transducers that allow for the direct conversion of light intensity into electrical energy.
Electrical symbolsOpto-isolator or OptocouplerAn optoisolator or optocoupler is a device that employs photosensitive components to separate its input and output connections—also known as an Opto-decoupler.
Electrical symbolsIndicator Lamp or Light BulbA lamp, indicator, or other device produces visible light in response to the passage of a current via its filament.
Electrical symbolsNOT GateLogic gate having just one input and one output; produces a logic 1 (HIGH) when the input is 0 (LOW); produces a 0 when the input is 1 (LOW) (Inverter).
Electrical symbolsNAND GateThe logic gate has two or more inputs that produce a logic 0 (LOW) output whenever ALL of its inputs are HIGH at logic 1 (equivalent to NOT plus AND).
Electrical symbolsAND GateThe logic gate has two or more inputs that produce a logic 1 (HIGH) when ALL of its inputs are at the same level (also known as “high”) (HIGH)
Electrical symbolsNOR GateThe logic gate has two or more inputs that produce a logic 0 (LOW) when ANY (or both) of its inputs are HIGH at logic 1 (equivalent to NOT + OR). When ALL of its inputs are HIGH at logic 1, the gate outputs logic 1.
Electrical symbolsOR GateA logic gate having two or more inputs that generate a logic 1 (HIGH) output if ANY (or both) of its inputs are at the logic 1 level (HIGH)
Electrical symbolsXNOR GateExclusive-NOR gate with two inputs generates a logic 1 (HIGH) output whenever both inputs are the same value (NOT + XOR) in the event both inputs are the same.
Electrical symbolsJ.K. Flip-FlopJ.K. (Jack Kilby) The letter J stands for “Set,” whereas the letter K stands for “Reset (Clear)” in a flip-flop, which also contains internal feedback.
Electrical symbolsS.R. Flip-FlopSet-Reset The flip-flop is a bistable device that can store one bit of data on each of its two outputs that are complementary.
Electrical symbolsData LatchWhen the EN enable pin is set to LOW, the data latch will store one data bit on its sole input. When the EN enable pin is set to HIGH, the data bit will be output without any modification.
Electrical symbolsD-type Flip-FlopD (Delay or Data) The flip-flop is a logic gate that takes a single input and alternates between two complementary outputs.
Electrical symbols1-to-4 DemultiplexerThe data received on a Demultiplexer’s single input pin is then sent to one of the numerous output lines.
Electrical symbols4-to-1 MultiplexerThe data on a multiplexer’s input pins is sent to only one device’s output lines.


Electric circuits are systems comprising components that may conduct electricity and are created to do so for a certain function. A source of electrical energy; components that either convert, disperse, or store this energy; connecting wires. These are the components that make up an electric circuit. Electrical circuits often use a fuse or circuit breaker to avoid power overload.


Frequently Asked Questions

1. What are the electrical schematic symbols?

In a schematic layout of an electrical or electronic circuit, a pictogram known as an electrical symbols is used to represent a variety of electrical or electronic devices or functions. These devices and functions include cables, batteries, resistors, and transistors, among other things.

2. What are the electrical switch symbols?

The switches are components that may be either electrical or electronic and are operated primarily via the application of pressure. Their purpose is to permit, halt, or temporarily or permanently redirect the flow of electrical current between a power source and an apparatus.


3. Which conducting material is used in electrical wires?

Copper is the most prevalent conductive material that is used in the production of electrical cables.

Electrical symbols


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