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

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

• A. 0-30 Volts
• B. 0-125 Volts
• C. 0-250 Volts
• D. 0-600 Volts

Answer: (C)

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

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