Electrical Exam Term
Volt
The standard unit of electrical potential difference (voltage) or electromotive force, representing the pressure that pushes electric current through a conductor.
Detailed Explanation
Named after Alessandro Volta, voltage is often compared to water pressure in a pipe. Standard US residential voltage is 120/240V. Commercial buildings typically use 120/208V (wye) or 277/480V systems. Voltage drop over long conductor runs must be considered — the NEC recommends no more than 3% drop on branch circuits and 5% total from service to final outlet.
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Practice QuestionEasy
Which of the following best describes the concept of Volt?
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