Elevator Mechanic Practice Exam

Your fluke digital multimeter reads 440vac, what value are you reading?

1. 440vac peak

2. 440vac peak-to-peak

3. 440vac RMS

4. RMS equivalent to 220vac

The correct answer is: 440vac peak

When reading a value of 440vac, your fluke digital multimeter is displaying the peak voltage. This means it is showing the maximum voltage that the AC circuit reaches, and then falls back down to zero before rising to the negative peak voltage. This is different from RMS (root mean square) values, which are the equivalent steady DC values that would produce the same amount of power in a resistor. Option B, peak-to-peak, refers to the total difference between the maximum and minimum voltage in an AC circuit, whereas option C, 440vac RMS, would be a lower value since it is taking into account the changing voltage over time. Option D is incorrect because RMS values are not equivalent to a specific AC voltage, but rather a measurement of the amount of power produced by the AC circuit. Therefore, option A, 440vac peak, is the most accurate representation of the voltage reading on your fluke digital multimeter.