Wiktor Wise
Electrical schematics can be intimidating to those unfamiliar with them, as they are often filled with lines, symbols, and information that may not be immediately understandable. However, once you understand the basics, they become much simpler to interpret. Electrical schematics are simplified representations of electronic circuits, standardizing the display of electronic circuits, components, labels, and connections. Each symbol represents a component, and each line represents a wire that connects them. Symbols are the building blocks of electrical schematics, and they can vary depending on the region and the schematic provider. For example, a diode, which is a polarized device that allows current flow in only one direction, is represented by a triangle with a flat edge as the positive lead and a straight line on the end as the negative lead. A light-emitting diode (LED) works the same way but emits light when the current passes through. The schematic symbol for an LED includes two arrows representing the emitted light.
| Characteristics | Values |
|---|---|
| Purpose | To show the functionality and connectivity between electric components |
| Symbols | Represent components |
| Lines | Represent wires which connect the components |
| Colours | Can indicate purpose, e.g. green wires often indicate a connection to the ground |
| Direction | Read from left to right, top to bottom |
| Marks and Tags | Identify each electrical component and distinguish between multiple identical objects |
| Attributes | Provide a detailed description of an electronic component beside its symbol |
| Voltage Nodes | Single-terminal schematic components which assign a specific voltage level to connected terminals |
| Power Source Symbols | Indicate whether the source is supplying direct current (DC) or alternating current (AC) |
| Diode Symbol | Two arrows pointing outwards, representing emitted light |
| Photodiode Symbol | Arrows point towards the diode, as it absorbs photons from light |
| Non-Polarized Capacitor Symbol | Two T shapes perpendicular to one another |
| Standard Logic Functions | AND, OR, NOT, and XOR, all with unique schematic symbols |
| Integrated Circuits | Usually represented by a rectangle with pins extending out of the sides |
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What You'll Learn
Standardized symbols
Electrical symbols are graphical representations of electrical components or devices used in schematic diagrams or circuit diagrams. These symbols are standardized and universally recognized, making it easier for engineers, technicians, and electricians to understand and interpret electrical plans.
These symbols are used to represent electrical and electronic devices and show how they are connected within a circuit. They identify the position and type of each component, such as whether it is resistive, inductive, capacitive, or mechanical. For example, voltage nodes, represented by specific symbols, are single-terminal schematic components that allow for assigning component terminals to particular voltage levels.
Additionally, standardized symbols help identify the power source in a circuit. For instance, batteries are often represented by a pair of disproportionate parallel lines, with the longer line indicating the positive terminal and the shorter line, the negative terminal. Symbols can also specify whether the source supplies direct current (DC) or alternating current (AC).
While standardized symbols provide a universal language for electrical schematics, it is important to recognize that symbol usage may evolve over time. The dynamic nature of electrical and electronic engineering demands flexibility in symbol standardization, allowing for modifications as new technologies and industry needs emerge.
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Power sources
Electrical schematics are a logical representation of the physical connections and layout of an electric circuit. They outline the functionality of an electric circuit and provide the basis for its assembly and troubleshooting. Electrical symbols are used to represent various electrical and electronic devices in a schematic diagram of an electrical or electronic circuit. These symbols are internationally standardized, so diagrams designed using them are recognizable and comprehensible by specialists from different countries.
Real-world sources of electrical energy, such as batteries, generators, and power systems, can be modeled for analysis purposes as a combination of an ideal voltage source and additional combinations of impedance elements. Voltage sources are two-terminal devices that can maintain a fixed voltage. An ideal voltage source can maintain a fixed voltage independent of the load resistance or output current. However, a real-world voltage source cannot supply unlimited current.
In electronics, there are various power source circuit symbols to specify the power source. When working with electronics, constant voltage sources are most commonly used. Two symbols are used to define whether the source is supplying direct current (DC) or alternating current (AC). Batteries, for example, are usually represented by a pair of disproportionate, parallel lines, with the longer line representing the positive terminal and the shorter line connecting to the negative terminal.
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Diode devices
Diodes are made from a combination of P-type and N-type semiconductor materials, known as a P-N junction, with leads attached to the two ends. The lead attached to the P-type semiconductor is called the anode, which is the positive side of the diode. The lead attached to the N-type semiconductor is called the cathode, which is the negative side. Diodes have polarity, and most of them only allow current to flow when positive voltage is applied to the anode. When a diode allows current flow, it is forward-biased, and when it is reverse-biased, it acts as an insulator.
There are several types of diodes, including Schottky diodes, photodiodes, and Zener diodes. Schottky diodes, also known as barrier diodes or hot-carrier diodes, are used in high-speed applications due to their fast-switching capabilities and low forward voltage drop. Photodiodes produce electrical currents when they absorb photons and are commonly used in sensors and solar cells. Zener diodes are employed to protect circuits from unsafe voltage levels.
Diodes are rated according to their type, voltage, and current capacity, and they have specific current and voltage ratings. These ratings represent the maximum voltage and current levels the diode can handle, and exceeding them can cause permanent damage to the diode or the entire circuit. To test the function and health of a diode, tools like digital multimeters are used. Understanding diode behaviour and characteristics is crucial for effective electrical schematic design and troubleshooting.
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Schematic diagrams
Schematic symbols are standardised around the world, with the International Electrotechnical Commission (IEC) issuing the IEC 60617 standard, which includes over 1750 symbols. The American National Standard Institute (ANSI) also provides a variety of specialised symbols, originally used for aircraft applications.
In an electronic circuit diagram, the layout of the symbols may not resemble the physical circuit, but rather aims to capture how it works. This can be contrasted with a wiring diagram, which preserves the spatial relationships between components. Schematic diagrams are often used for the maintenance and repair of electronic and electromechanical systems.
Symbols are the building blocks of electrical schematics. Each component on a schematic should have a unique name and value, helping to identify it. For example, resistors are usually represented by zig-zag lines, with two terminals extending outward. Capacitors are differentiated by their capacitance value, while inductors are differentiated by their inductance value.
Some other common symbols include:
- Voltage nodes: single-terminal schematic components that connect component terminals to assign them to a specific voltage level.
- Power source circuit symbols: these specify the power source, with constant voltage sources being the most common.
- Switches: multiple switches with a dotted line intersecting the middle actuator.
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Circuit representations
Circuit diagrams, also known as wiring diagrams, electrical diagrams, elementary diagrams, or electronic schematics, are graphical representations of electrical circuits. They use pictorial or schematic diagrams to depict the components and interconnections of a circuit using standardized symbolic representations. The symbols used in circuit diagrams have varied across countries and time but are now largely internationally standardized.
A pictorial circuit diagram uses simple images of components, while a schematic diagram employs symbols to represent the components and connections. The schematic diagram does not necessarily reflect the physical arrangement of the components in the final device. Instead, it focuses on illustrating the electrical connections and the flow of the main signal or power path. The standard sequence for organizing a schematic is from left to right and top to bottom, mirroring the flow of the signal or power.
Symbols are fundamental to electrical schematics, serving as the building blocks for representing the components and connections in a circuit. These symbols can represent various elements, such as electric cells, batteries, switches, wire joints, electric bulbs, resistors, and more. For instance, an electric cell is depicted by a long and short parallel line, with the long line indicating the positive terminal and the short line representing the negative terminal. A battery, comprising multiple electric cells, is represented by arranging these symbols in a series. A switch is shown as a line with a gap, and a wire joint is denoted by a dot or a small circle where wires intersect.
Resistors, which limit the flow of electric current, are typically represented by zigzag lines with two terminals extending outward. However, international symbols may use a featureless rectangle instead. Variable resistors, also known as rheostats or potentiometers, modify the standard resistor symbol by adding an arrow. In the case of a variable resistor, the arrow is placed diagonally across the middle, while in a potentiometer, it becomes the third terminal.
Logic functions such as AND, OR, NOT, and XOR have unique schematic symbols as well. By adding a bubble to the output, these functions are negated, resulting in NANDs, NORs, and XNORs. Integrated circuits, due to their variety and unique tasks, usually lack a distinct circuit symbol. They are often represented by a rectangle with pins extending from the sides, each labelled with a number and a function.
Circuit diagrams are essential for understanding, designing, and maintaining electrical and electronic equipment. They provide a visual representation of the connections and layout of an electric circuit, facilitating assembly, troubleshooting, and further design iterations.
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Frequently asked questions
An electrical schematic is a simplified representation of an electric circuit. It uses symbols and lines to represent the functionality and connectivity between the circuit's components.
Each symbol in an electrical schematic represents a component. For example, a diode is represented by a triangle with a flat edge as the positive lead and a straight line on the end as the negative lead. The symbols are not the same everywhere, so you may need to use your assessment.
Each line in an electrical schematic represents a wire that connects the components. The colour of the wire usually indicates its purpose. For example, green wires often indicate a connection to the ground.
