Upon determining that the Voltage is approximately 120 volts, which scale should be selected on an analog meter for the best accuracy?

For measuring a voltage of approximately 120 volts, selecting a scale that allows for the best accuracy is crucial. The option of 0-250 volts is ideal because it provides a suitable range that accommodates the voltage being measured while also allowing for more precise readings without risking overload.

When using an analog meter, the goal is to choose a scale that minimizes the reading error, which is often determined by the fraction of the full scale that the measurement represents. In this case, by choosing the 0-250 volt range, the measurement of 120 volts is approximately 48% of the maximum scale. This positioning allows for better resolution in the meter’s readings compared to lower ranges where 120 volts would occupy a more significant proportion of the available measurement range, potentially leading to less precise readings.

Meanwhile, selecting a lower scale like 0-125 volts would put the meter close to its maximum rating, which could lead to less accuracy. The 0-30 volts and 0-600 volts ranges would not be appropriate as they either do not encompass the voltage being measured efficiently (in the case of 0-30 volts) or are too broad, which could make it harder to obtain a precise reading (in the case of 0-600