Potentiometers
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Potentiometers

Resistors provide a fixed value of resistance that blocks or resists the flow of electrical current around a circuit, as well as producing a voltage drop in accordance with Ohm’s law. Resistors can be manufactured to have either a fixed resistive value in Ohms or a variable resistive value adjusted…

Resistivity
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Resistivity

Ohms Law states that when a voltage (V) source is applied between two points in a circuit, an electrical current (I) will flow between them encouraged by the presence of the potential difference between these two points. The amount of electrical current which flows is restricted by the amount of…

Varistor Tutorial
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Varistor Tutorial

Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a similar way to the zener diode. The word “Varistor” is a combination of the words VARI-able resi-STOR used to describe their mode of operation way back in their early days of…

Potential Difference
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Potential Difference

Unlike current which flows around a closed electrical circuit in the form of electrical charge, potential difference does not move or flow it is applied. The unit of potential difference generated between two points is called the Volt and is generally defined as being the potential difference dropped across a fixed resistance…

Resistors in Series
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Resistors in Series

Individual resistors can be connected together in either a series connection, a parallel connection or combinations of both series and parallel, to produce more complex resistor networks whose equivalent resistance is the mathematical combination of the individual resistors connected together. A resistor is not only a fundamental electronic component that…