Question 164Electricity/Electronics - QMED70% to pass
Whether analog or digital, what are most AC voltmeters calibrated to measure?
AI Explanation
The correct answer is D) root-mean-square (RMS) voltage.
Most AC voltmeters, whether analog or digital, are calibrated to measure the RMS value of an AC voltage. This is because the RMS value represents the effective or "heating" value of the AC voltage, which is the value that determines the power dissipated in a load. The RMS value is the square root of the average of the squares of the instantaneous voltage values over one complete cycle, and it is the value that is most useful for practical electrical measurements.
The other options, such as peak-to-peak voltage (A) or peak voltage only (C), do not provide the same level of information about the effective power of the AC signal and are not the primary calibration for most voltmeters.
Related Questions
#162 Which of the following precautions should be taken when troubleshooting various power circuits using a digital multimeter? #163 Circuit resistance is usually measured off-line (de-energized) with an ohmmeter. In the absence of an ohmmeter, however, resistance may be INDIRECTLY measured on-line (energized) using what meter (or meters)? #165 Which of the meters listed should only be used after a circuit has been electrically de-energized? #166 What practice could potentially damage a multimeter? #167 Which of the listed statements is correct when using a digital multimeter set up as an ohmmeter?