When the voltage has been determined to be approximately 120 volts, which scale on an analog meter should be selected for most accuracy?

Selecting the correct scale on an analog meter is crucial for obtaining the most accurate reading. In this case, when measuring a voltage of approximately 120 volts, choosing the scale of 0-250 volts is the most appropriate option.

The reason this choice provides the most accuracy relates to the resolution and scale of the measurement. A scale that is too high, like 0-600 volts, could lead to a less precise reading because the total range is wide and the needle may fluctuate more, making it challenging to pinpoint the exact voltage. Similarly, a scale of 0-125 volts could also be limiting. Although it is closer to the voltage being measured, there is little room for any fluctuations or could cause the meter to strain at the upper end of its scale.

By using the 0-250 volts scale, the meter has a sufficient range to provide a clear and precise reading of a 120-volt measurement, ensuring that the meter's resolution is optimized. This promotes accuracy as the needle is more likely to fall in an area where it can be read with confidence, giving a better representation of the actual voltage being measured.