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

For optimal accuracy when measuring a voltage that is approximately 120 volts, selecting the scale that closely matches the voltage level is key. In this context, choosing a scale of 0-125 volts allows the needle to operate within a range that provides fine resolution and minimizes measurement error, while being sufficiently above the target voltage to ensure full scale deflection.

Choosing a scale that is too high, such as 0-250 volts or 0-600 volts, can lead to less precise readings as the meter's sensitivity decreases, making it more difficult to determine the exact voltage. A scale of 0-30 volts would be inadequate, as it is significantly lower than the measured voltage, resulting in potential overload or inaccurate readings.

Thus, the 0-125-volt scale stands out as the best option for ensuring accurate voltage measurements in this scenario.