Glossary Archive | Tek-Trol

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Voltage

Voltage (potential difference): The voltage between two points in an electrical circuit is a measure of the potential difference or the force, that is pushing electrons between these two points. It is analogous to water pressure in a water system. Voltage is measured in volts and is directly proportional to the current and resistance of a circuit: V=IR, where V = potential difference in volts, I = current in amperes (amps) and R = resistance in ohms. This is Ohm’s law.

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Voltage Relay

A relay that detects when the voltage in an AC circuit reaches a preset voltage. There are two basic types of voltage relay operation: overvoltage detection and undervoltage detection. Voltage relays are used to detect rapid increases in voltages due to a generator failure, low voltages caused by power interruptions or short circuits, etc.

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