Standard Electrical Symbols For Electrical Schematic Diagrams
Electrical symbols virtually represent the components of electrical and electronic circuits. This article shows many of the frequently used electrical symbols for drawing electrical diagrams. Though these standard symbols are simplified，the function descriptions can make you understand clearly.
Below lists most commonly used electrical and electronic symbols that can help you get started quickly.
|Name||Electrical Symbol||Alternate Symbol||Function Description|
|ground||A connection to the earth. Used for zero potential references and electrical shock protection.|
|equipotentiality||It is a symbol to identify components that have the same voltage (i.e., same electrical potential or equipotential). Since equipotential surfaces all have the same voltage, you won't get shocked if you touch two such surfaces (unless, of course, you are also touching some OTHER part that has a different potential from the first two).|
|chassis ground||Connected to the chassis of the circuit.|
|battery||It supplies electrical energy and generates constant voltage.|
|resister||A resistor restricts the flow of current, for example, to limit the current passing through an LED. A resistor is used with a capacitor in a timing circuit.|
|attenuator||It looks like a box with input and control logic on one side and output on the other side.|
|capacitor||A capacitor stores the electric charge and is used with a resistor in a timing circuit. It can also be used as a filter to block DC signals but pass AC signals.|
|accumulator||Accumulators are designed to increase or relieve pressure in the system.|
|antenna||An antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element.|
|loop antenna||A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductors with its ends connected to a balanced transmission line.|
|crystal||A crystal oscillator uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with an exact frequency.|
|circuit breaker||A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.|
|fuse||A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit.|
|inductor||A coil of wire creates a magnetic field when current passes through it. It may have an iron core inside the coil. It can be used as a transducer converting electrical energy to mechanical energy by pulling on something. It is a passive two-terminal electrical component used to store energy in a magnetic field.|
|explosive squib||Explosive squib is often used on stage and film to trigger various special effects.|
|sensing link squib|
|Surge protectors protect your electronics from power surges in your electrical system.|
|instrument||For example, a voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit. The wattmeter is an instrument for measuring the electric power in watts of any given circuit.|
|delay element||The Delay element provides a specified delay between the actuation of the propellant-actuated devices.|
|permanent magnet||A permanent magnet is a material or object that produces a magnetic field.|
|bell||The electric bell is found in an ordinary house doorbell, and when activated, it makes a ringing sound.|
|buzzer||An electrical buzzer is similar to the bell that makes a constant buzz noise instead of a single tone or bell sound.|
|lamp||A transducer converts electrical energy to light, which is used for a lamp providing illumination, for example, a car headlamp or torch bulb.|
|speaker||A speaker can take digital input and turn it into analog sound waves. One of the most important parts of a wide range of electrical products like TVs and telephones.|
|oscillator||It produces a repetitive electronic signal, often a sine wave or a square wave.|
|AC source||Alternating Current, continually change direction.|
|DC source||Direct Current, always flow in one direction.|
Each electrical component may have numerous possible representations. The electrical symbols can vary from country to country nowadays but are, to no small extent, internationally standardized. Some electrical symbols become virtually extinct with the development of new technologies. In cases where there is more than one universal electrical symbol, we have tried to give an alternate representation.
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How to Use Electrical Symbols
Open Edraw electrical diagram maker, and this large collection of symbols are found in the Engineering category in the Available Templates list. After you start Edraw, click the icon of Basic Electrical Symbols to open the stencil that includes all shapes for making circuit diagrams.
Drag the shape that you need directly onto the canvas. Instead, you can click its icon and then hit on the location where you want to place it.
You can resize the selected shape by dragging the green selection handles. A double-sided arrow shows the direction to which you can move the mouse, and you only can move the shape when a four-direction arrow appears.
In electrical diagram software, you can use the action button to choose the right electrical symbols with one click. It shows when the shape is selected or when the pointer is over the shape. For example, the variable resister can be turned into 7 kinds of symbols by clicking the button.
Look at the video below to see the various types of electrical symbols and create your own circuit diagram in minutes!