OCS/ TIMER TO 6 - 15V DS B C E - + C1 10 m F R1 10K R2 53.6K R3 20K L3 50uH C2 200mF C3 .22 m F R4 6.2K R6 220 Q1 MPSH11 XTA 149.89 MHz L2 0.06uH C8 .01 m F L4 50uH L5 50uH S1 T1 C7 180mF C6 27mF C5 .01 m F R5 3.3K C4 .01 m F TO 6 - 15V DS

Electrical Symbols

Get Easy-to-Use Electrical Symbols for Circuit Diagrams

Electrical symbols

Basic Electrical Symbols

Let's go over som sample electrical symbols and what they represent.

Ground or Earth Electrode

Ground or Earth

A ground symbol identifies a ground terminal. It can be used for a zero potential reference point from where current is measured. It is also for electrical shock protection. There are a few different ground symbols. The one we're showing here is "Earth", but there's also a Chassis and Digital/Common ground with slight variations to this symbol.

Resistor

Resistor

A resistor reduces current flow. In a schematic, this is represented with a few zig zag squiggles. We're showing the US/Japan version of this symbol. The UK uses a simple box over a straight line. There are also symbols for variable and adjustable resistors as well as thermal and preset resistors.

Switch

Switch

Disconnects the current when open. We're showing a simple SPST (single-pole single-throw) toggle switch, but there are variations for SPDT, pushbutton, dip, relay, and more. For a complete list of switch symbols, check out SmartDraw's electrical symbol library.

Capacitor

Capacitor

A capacitor symbol shows two terminals running into plates. The curved plate indicates that the capacitor is polarized. The curved side has lower voltage. A small plus sign can be added to the straight side indicated the positive pin.

Fuse

Fuse

A fuse protects electrical circuits by stopping the flow of current when the intensity of current exceed a set value. It does this by melting a special wire.

Antenna

Antenna

Marks a device, rod, or wire designed to capture radio and electromagnetic waves into electrical signals and vice versa.

Inductor

Inductor

An inductor is also called a coil or reactor. The coils store energy in a magnetic field or flux. An inductor symbol looks like a series of looped coils.

Transformer

Transformer

A transformer is two or more coils coupled by magnetic induction. It helps keep the frequency and reduce tension in an AC circuit.

Motor

Motor

A motor is a device that can transform electric energy into mechanical energy.

Source

Source

Represents the power source for your electronics. This symbol represent a direct current (DC). To represent AC current, you'd replace the plus and minus sign with a wave.

Battery

Battery

Batteries are represented on a schematic with a pair of disproportionate, parallel lines. The number of lines indicates the number of series cells in the battery.

Diode

Diode

A diode only allows current to flow in one direction. It's always polarized with an anode (A, positive) and cathode side (C, negative).

Diode LED

Diode LED

A diode LED is a standard diode symbol with two small arrows showing the emission of light.

Make Wiring and Circuit Diagrams

Making an electrical diagram is easy when you have thousands of electrical symbols at your fingertips.

SmartDraw lets you choose from an enormous library of professionally designed electrical symbols for block diagrams, circuit panels, wiring diagrams, and many other types of drawings.

SmartDraw is easy to use too. Just select a template and start customizing. Click and stamp electrical symbols onto your layout. Add connecting lines and arrows. Reposition them on the page and SmartDraw will keep them connected, automatically.

Export it to Microsoft Word®, Excel®, PDF, or PowerPoint® with a single click.

You and your team can work on the same electrical diagram by saving it to a shared SmartDraw folder or by using your favorite file sharing apps like Dropbox®, Google Drive™, Box® or OneDrive®. You can also share files with non SmartDraw users by simply emailing them a link.

Electrical symbols

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