Otis Singleton
Circuit symbols are simple drawings or pictograms that represent electrical components in a circuit diagram. These diagrams are used to explain how a circuit works and to represent even the most intricate circuits. Each circuit symbol represents a particular component, no matter what that component looks like. For example, the circuit symbol for a switch in the 'on' position is represented by two circles joined by a straight line, indicating that the switch is closed and the circuit is complete.
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What You'll Learn
The switch symbol for 'on' is a closed circuit
Circuit symbols are simple drawings or pictograms that represent electrical components in a circuit diagram. They are used to show how a circuit works and how electrical energy flows through it. Each symbol represents a different component, such as a battery, switch, or lamp, and each has a specific meaning.
The switch symbol is just one of many circuit symbols. Other common ones include the battery, which consists of two or more cells put together, and the bulb, which is a circle with a cross through it. These symbols are standardised, but they may vary depending on the engineering discipline and local traditions. For example, lighting and power symbols used in architectural drawings may differ from those used for electronic devices.
Circuit diagrams use these symbols to represent the various components in a concise and intuitive way. They are a visual representation of the circuit, making it easier to understand how it functions. By using symbols, complex circuits can be simplified, and anyone can sketch an electrical diagram, provided they know the basic structures of the symbols.
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The bulb symbol is a circle with a cross through it
Circuit symbols are simple pictures that represent electrical components in a circuit diagram. They are used to show how electrical energy flows around an electrical circuit. Each symbol can depict a particular component, no matter what that component looks like.
The symbol for a switch in the 'off' position is depicted by two small circles on either side of a gap, with a straight line drawn at an angle from one of the circles, indicating that the circuit has an opening and is not complete. When the switch is turned on, the symbol changes to show the two circles joined by a straight line, indicating that the switch is closed and the circuit is complete.
It is important to note that while there are standard symbols, variations do exist depending on the engineering discipline and local or national traditions. For example, lighting and power symbols used in architectural drawings may differ from those used for electronic devices.
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The battery symbol is made up of two or more cells
The battery symbol is a fundamental component of electrical circuit diagrams, representing a crucial source of power. Interestingly, the symbol we use today for batteries has evolved from its original meaning. Historically, the term "battery" specifically referred to a device composed of multiple cells. However, over time, the definition expanded to include devices with even a single cell.
The battery symbol is a visual representation of this concept, consisting of two or more cell symbols combined. Each cell in the battery symbol is depicted by a pair of parallel lines, with one line longer than the other. These lines represent the two electrodes of a cell, with the longer line indicating the positive terminal and the shorter line denoting the negative terminal. This configuration is essential to ensure that batteries are used in the correct orientation.
The number of pairs of lines in the battery symbol may sometimes indicate the number of cells within the battery. However, it is not uncommon to find a simplified representation, where only a few pairs of lines are used to signify a battery, without specifying the number of cells or their polarity. This simplification allows for a more concise and standardised symbol that can be easily recognised and utilised in circuit diagrams.
The battery symbol is versatile and applicable to various battery types, ranging from standard-format batteries to industrial-grade batteries and even custom battery packs. Each type of battery, despite its unique physical characteristics, is universally represented by the same symbol. This standardisation simplifies circuit diagrams and ensures that anyone interpreting the diagram understands the power source, regardless of the specific battery model.
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The switch symbol for 'off' is an open circuit
Electrical circuits are represented by schematic symbols, which are simple drawings or pictograms that represent various components in a circuit diagram. These symbols are standardised, though they may differ across engineering disciplines.
One such symbol is that of a switch. The switch symbol represents the closed and open circuit connection in a circuit. The switch symbol for the 'off' position shows an incomplete circuit with a gap and a line at an angle. This indicates that the circuit is open and not complete, and therefore the electrical energy stops flowing. The symbol consists of two small circles on either side of a gap, with a straight line drawn at an angle from one of the circles.
The switch symbol for 'on', on the other hand, indicates that the circuit is complete and functional. This symbol shows two circles joined by a straight line, indicating that the switch is closed.
Switches play a crucial role in electrical circuits by allowing the circuit to be turned on or off. When the switch is turned on, it completes the circuit, enabling the flow of electrical energy. Conversely, when the switch is turned off, it creates an open circuit, disrupting the flow of electricity.
In summary, the switch symbol for the 'off' position depicts an open circuit with a gap and an angled line, while the 'on' position symbol illustrates a closed and complete circuit through the use of two connected circles. These symbols are essential for understanding and designing electrical circuits, providing a standardised representation of the switch's functionality within the circuit.
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A dual on-off switch isolates live and neutral connections
A dual on-off switch, also known as a DPDT (Double Pole, Double Throw) switch, is a type of electrical switch that can isolate both the live and neutral connections in a circuit. This makes it particularly useful for switching mains electricity, as it can completely break the circuit and prevent any current flow.
The symbol for a switch in the 'on' position consists of two circles joined by a straight line, indicating that the switch is closed and the circuit is complete. In contrast, the 'off' position is depicted by two small circles on either side of a gap, with a straight line drawn at an angle to one of the circles, signifying an opening in the circuit. These symbols are used to represent the state of the switch in electrical diagrams, providing a clear indication of whether the circuit is active or inactive.
In the context of a dual on-off switch, the 'on' position indicates that the switch is closed, allowing electricity to flow through the circuit. This means that both the live and neutral connections are active, and the circuit is fully functional. Conversely, the 'off' position of the dual on-off switch opens the circuit, disrupting the flow of electricity. By isolating both the live and neutral connections, the dual on-off switch ensures that there is no electrical current passing through the circuit.
The ability to isolate both live and neutral connections is what sets the dual on-off switch apart from a typical single-pole switch. This unique feature makes it ideal for applications where complete control over the electrical flow is required, such as in the case of exterior lighting or motor reversals. By using a dual on-off switch, users can ensure that the circuit is truly deactivated when turned off and safely activated when turned on, providing a reliable means of controlling electrical devices.
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Frequently asked questions
A circuit symbol is a simple picture that is used to represent an electrical component or device in an electric circuit, such as a battery, switch or lamp.
The switch symbol ("on") is represented by two circles joined by a straight line, indicating that the switch is closed and the circuit is complete.
The switch symbol ("off") has a line at an angle to show that the circuit has an opening and is not complete.
The battery symbol is made up of two or more cell symbols together. The cells in the battery symbol are represented by two uneven lines in parallel with positive and negative polarity mentioned on them.
