China
Africa
Explore chapters and articles related to this topic
Blueprint Reading
Published in Frank R. Spellman, The Science of Wind Power, 2022
In Figure 6.78, the schematic shows a simple circuit with switches. A switch is a device for making or breaking the electrical connection at one point in a wire. A switch allows the starting, stopping, or changing of the direction of current flow in a circuit. Figure 6.80 shows some common switches and their symbols.
Direct Current (dc) Electronics
Published in Dale R. Patrick, Stephen W. Fardo, Electricity and Electronics Fundamentals, 2020
Dale R. Patrick, Stephen W. Fardo
A common electronic component is a switch, such as those shown in Figure 1-20. The simplest switch is a single-pole, single-throw (SPST) switch. This switch turns a circuit on or off. In Figure 1-21(a), the symbol for a switch in the “off” or open position is shown. There is no path for current to flow from the battery to the lamp. The lamp is off when the switch is open. Figure 1-21(b) shows a switch in the “on,” or closed, position. This switch position completes the circuit and allows current to flow.
Motor controllers
Published in Raymond F. Gardner, Introduction to Plant Automation and Controls, 2020
Switches are classified by their actuation mechanism. Some types include toggle, pushbutton, rocker, and rotary. They are also classified by their final position after actuation, where switches are either maintained contact or momentary. A maintained-contact switch stays toggled into its new position by a snap-action mechanism or detent to hold its new position after the actuating force is removed. Momentary switches are spring-loaded to return them to the starting position, after the they are released.
DFT study of hydrazone-based molecular switches: the effect of different stators on the on/off state distribution
Published in Molecular Physics, 2019
Silvia Angelova, Vesselina Paskaleva, Nikolay Kochev, Liudmil Antonov
Information technology has proceeded through ceaseless miniaturisation and recurrent invention of new devices to handle information (to store, process, and communicate it). The silicon-based elements are now approaching physical limits and there is a need for new devices based on new materials (and new physics). Creation of single molecule electronic devices is of great importance to the field of post-silicon electronics [1,2]. The electrical switch is any device used to interrupt the current (the flow of electrons) in a circuit. Switches are basically binary devices: they are either completely on (‘closed’) or completely off (‘open’). In molecular electronics, the term ‘switch’ is used to assign any molecular structure able to shift reversibly between two on- and off-stable states in response to environmental stimuli, such as changes in pH, light, temperature, an electric current, microenvironment, or in the presence of an ion [3].
Dynamic optimization of dual-mode hybrid systems with state-dependent switching conditions
Published in Optimization Methods and Software, 2018
Eunice Blanchard, Ryan Loxton, Volker Rehbock
A hybrid system is a system that involves both time- and event-driven dynamics [2,4,14,17,23]. The event-driven dynamics typically cause switches in the time-driven dynamics (which are often described by differential equations). Such switches can be classified into two types: controlled switches and autonomous switches. Controlled switches are triggered externally (for example, by changing a gear or switch) and can be manipulated directly by the system operator. Autonomous switches, on the other hand, occur implicitly when the state trajectory crosses from one region in the state space to another; they cannot be controlled directly.