G2 Gas Fitter Practice Exam

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The voltage reading across an open switch in an energized circuit reflects what value?

  1. Zero voltage

  2. Voltage drop

  3. Applied voltage

  4. Short circuit voltage

The correct answer is: Applied voltage

In an energized circuit with an open switch, the voltage reading across the terminals of the switch reflects the applied voltage. This is because when the switch is open, it creates an interruption in the circuit, effectively preventing current from flowing. As a result, the full voltage from the power source is present across the open switch, which can be measured as the applied voltage. Understanding this concept is vital for troubleshooting and ensuring proper measurements in electrical systems. When working with circuits, recognizing that an open switch does not consume voltage allows technicians to determine whether voltage is being applied correctly.

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