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protective relay An electromechanical or electronic device that detects faults on a power system and can signal circuit breakers to operate. proximity effect The increase in circuit resistance when the magnetic fields of multiple AC currents interact. pulse transformer A transformer designed to create or transmit pulses. pulse-width modulation
A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay ...
An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering ...
IEEE 315 Contacts, Switches, Contactors, and Relays Symbols (12).svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 62 DOI: 10.1109/IEEESTD.1993.93397. ISBN: 0738109479. Author
IEEE 315 Contacts, Switches, Contactors, and Relays Symbols (6).svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 63 DOI: 10.1109/IEEESTD.1993.93397. ISBN: 0738109479. Author
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Analog multimeter Digital multimeter. A multimeter (also known as a volt-ohm-milliammeter, volt-ohmmeter or VOM) [1] is a measuring instrument that can measure multiple electrical properties. [2] [3] A typical multimeter can measure voltage, resistance, and current, [4] in which case can be used as a voltmeter, ohmmeter, and ammeter.
IEEE 315 Contacts, Switches, Contactors, and Relays Symbols (10).svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 64 DOI: 10.1109/IEEESTD.1993.93397. ISBN: 0738109479. Author