Molly Ayala
Circuit symbols are concise drawings or pictograms that represent electrical components in a circuit diagram. They are used to help plan circuits before they are built and to help electrical engineers understand what they are building. Each symbol explains the basic physics behind the component it represents, and most are based on different national and international standards. Symbols are used for each electrical device or component in a circuit, such as passive components (resistors, capacitors and inductors), active components (diodes, transistors, amplifiers and transformers), and power sources (batteries).
| Characteristics | Values |
|---|---|
| Purpose | Used in circuit diagrams (schematics) to represent electronic components |
| Format | Concise drawings or pictograms |
| Function | Help plan circuits before building them |
| Examples | Symbols for a switch, battery, bulb, motor, buzzer, generator, LED, zener diode, transistor, transducer, wire, etc. |
| Standards | IEC, JIC, ANSI, IEEE, etc. |
| Variations | Engineering disciplines may use different symbols; national or local variations to international standards exist |
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What You'll Learn
- Circuit symbols are used in circuit diagrams to represent electronic components
- Symbols include the ground electrode, battery, and resistor
- A battery symbol is made up of two or more cell symbols
- A switch symbol represents a closed and open circuit connection
- Transducers convert electrical energy to light, sound, heat, or kinetic energy
Circuit symbols are used in circuit diagrams to represent electronic components
Fundamental electrical and electronic symbols include the ground electrode, battery, and resistor. These symbols can be used to represent even the most intricate circuits. A basic circuit, for instance, can be represented by a battery, a switch, and a bulb connected in a closed loop. As the number of components increases, the visual complexity of the diagram also rises. This is where circuit symbols become particularly useful, simplifying our understanding of the circuit and saving time.
The precise meaning of a symbol is conveyed through the inclusion of dots, lines, letters, letter spacing, shading, and numbers. While electrical symbols are standardized, they may vary depending on the engineering discipline and local traditions. For instance, lighting and power symbols used in architectural drawings may differ from those used for electronic devices. It is important to be familiar with the basic structure of various symbols to comprehend circuits and their corresponding meanings.
Some other common circuit symbols include the switch, motor, buzzer, and generator. The switch symbol represents the closed and open circuit connection in a circuit. The motor symbol represents the transformation of electrical energy from the battery into mechanical movement. A buzzer symbol indicates the conversion of electrical energy into sound energy, while a generator can replace a battery as a power source, converting movement energy into electrical energy.
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Symbols include the ground electrode, battery, and resistor
Electrical circuit symbols are simple pictures used to represent electrical components in a circuit diagram. They are useful when designing electrical circuits, helping us to plan the circuits before we build them.
One such symbol is the ground electrode, which connects the system's neutral conductor or equipment to a grounding electrode or a point on the grounding electrode system. This is called "system grounding", and most electrical systems are required to have it. The purpose of connecting an electrical system to the physical ground (earth) is to limit voltage surges from lightning strikes or contact with higher-voltage lines.
Another common symbol is that of the battery, which is a power source for many circuits. The battery symbol is made up of two or more cell symbols together, with the longer line representing the positive terminal and the shorter line the negative terminal.
Finally, all types of resistors have their own symbols, which are used when drawing a circuit diagram. The IEC 60617 standard is the international standard for these symbols, although local standards are sometimes used as well.
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A battery symbol is made up of two or more cell symbols
Circuit symbols are simple drawings or pictograms that represent various components in a circuit diagram. They are useful when designing electrical circuits, as they help plan the circuits before building them. Each symbol can explain the basic physics behind the component it represents.
The battery symbol is one of the first symbols you will come across when learning about circuit diagrams. A battery is an energy source made of cells, with a chemical electrolyte inside providing polarity. The battery symbol is made up of two or more cell symbols. The cell symbol consists of two parallel lines, with the longer line representing the positive terminal, and the shorter line the negative terminal. When two or more of these cell symbols are joined together, they form the battery symbol.
The battery symbol is used to represent a single battery, like the ones used in torches or TV remotes. However, this is called a cell in physics. It only becomes a battery when two or more cells are connected. This is why the battery symbol is made up of two or more cell symbols.
It is important to note that batteries can be connected in different ways to achieve different results. For example, connecting two 6-volt batteries in series will give you 12 volts and 2 amps. Connecting batteries in series increases the voltage, while connecting them in parallel increases the amperage.
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A switch symbol represents a closed and open circuit connection
Circuit symbols are essential for electrical diagrams, providing a standardized representation of complex circuits and components. They are simple pictures that represent electrical components in a circuit diagram. Each symbol is designed to explain the basic physics behind the component it represents. Symbols are used to represent passive components like resistors, capacitors, and inductors, as well as active components like diodes, transistors, amplifiers, and transformers.
Switch symbols are among the most commonly used circuit symbols and represent a closed and open circuit connection. A switch turns the circuit on or off by completing or breaking the circuit loop. When the switch is turned on, the circuit is complete, and electricity can flow. Conversely, when the switch is turned off, the circuit is open, and the electrical energy stops flowing.
The switch symbol in the 'off' position typically consists of two small circles on either side of a gap, with a straight line drawn at an angle from one of the circles. This angled line indicates that the circuit has an opening and is not complete. In contrast, the switch symbol in the 'on' position would show a continuous line, representing a closed circuit connection.
Different types of switches have distinct symbols. For example, a single-pole, single-throw (SPST) switch is represented by a single line, indicating control over the current flow in a single path. On the other hand, a double-pole, single-throw (DPST) switch is depicted with two lines with a shared endpoint, reflecting its ability to simultaneously control the flow of current in two separate circuits.
Understanding these switch symbols is crucial for engineers, electricians, and technicians to effectively communicate and interpret the position and actions of switches within electrical circuits.
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Transducers convert electrical energy to light, sound, heat, or kinetic energy
Transducers are devices that convert energy from one form to another. They are classified as input or output devices, depending on the direction in which they transfer energy or information. Input transducers convert some property or effect into an electrical signal, while output transducers start with electricity and generate a mechanical or other effect.
Transducers are often used in automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities such as energy, force, torque, light, motion, and position. This process, known as transduction, enables the measurement, monitoring, and control of various physical phenomena.
For example, in sound and vibration applications, transducers convert mechanical energy (vibrations or sound waves) into electrical energy or vice versa. Microphones, for instance, convert sound waves into electrical signals for recording and amplification, while loudspeakers convert electrical signals back into sound waves for audio playback.
Transducers can also convert electrical energy to light. For example, LED bulbs convert almost all electrical energy into light energy with minimal waste as heat. Transducers can further convert electrical energy to heat, and to kinetic energy (motion).
Circuit symbols are used in circuit diagrams to represent the various components and their functions. For example, the battery symbol is made up of two or more cell symbols, with the longer line indicating the positive terminal and the shorter line the negative terminal. The bulb symbol is a circle with a cross through it, while the LED symbol is a triangle pointing to a straight line. These symbols help plan circuits before building them and facilitate the representation of intricate circuits.
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