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Some wirewound power resistors have a tapping point that can slide along the resistance element, allowing a larger or smaller part of the resistance to be used. Where continuous adjustment of the resistance value during operation of equipment is required, the sliding resistance tap can be connected to a knob accessible to an operator.
Various resistor types of different shapes and sizes. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
They can be used to represent ideal batteries and power supplies; examples are voltage sources; and current sources. Dependent sources – These are two-port elements with a voltage or current source proportional to the voltage or current at a second pair of terminals. These are used in the modelling of amplifying components such as transistors,
A power tool is a tool that is actuated by an additional power source and mechanism other than the solely manual labor used with hand tools. The most common types of power tools use electric motors. Internal combustion engines and compressed air are also commonly used. Tools directly driven by animal power are not
Fixed-value liquid resistors are typically used where very high power dissipation is required. They are used in the rotor circuits of large slip ring induction motors to control starting current, torque and to limit large electrical fault currents (while other protection systems operate to clear or isolate the fault).
Craftsman's V20 Cordless Multi-Use Garden Tool Kit, another winner in our Home Renovation Awards, can dig up to 25 holes per minute and a single charge on the 20-volt battery can provide enough ...
It is better if the alloy used has a high resistivity, since a shorter wire can then be used. In many situations, the stability of the resistor is of primary importance, and thus the alloy's temperature coefficient of resistivity and corrosion resistance play a large part in material selection.
Casual use in an engineering class has been cited as evidence of the sexism faced by women in scientific fields. [15] Latanya Arvette Sweeney, associate professor of computer science at Carnegie Mellon, mentions yet another as one reason why she felt alienated and eventually dropped out of MIT in the 1980s to form her own software company. [16]
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