(I) What is the resistance of a voltmeter on the 250-V scale if the meter sensitivity is 30,000

step 1 sensitivity of meter tells us that how many oms of resistance are there per volt of full scale r

(I) What is the resistance of a voltmeter on the 250-V scale...

Key Concepts

Voltage Range Scaling

Voltage range scaling refers to the adjustment of the meter’s effective internal resistance based on the voltage range being measured. By multiplying the meter sensitivity in ohms per volt by the selected voltage range, one obtains the total internal resistance applicable for that measurement. This scaling is essential for designing measurement instruments that can adapt to different voltage levels while providing reliable and precise readings.

Meter Sensitivity

Meter sensitivity, expressed in ohms per volt (?/V), represents how much internal resistance a meter provides for each volt of its range. It is a key parameter in instrument design because it determines the loading effect on a circuit and affects the accuracy of the voltage measurement. A higher sensitivity implies a higher internal resistance, which minimizes the influence of the meter on the circuit being measured.

Voltmeter Internal Resistance

Voltmeter internal resistance is the inherent resistance present within the measurement device. It is crucial to have a high internal resistance in a voltmeter so that it does not significantly alter the voltage of the circuit under test. The internal resistance is calculated by multiplying the meter's sensitivity (?/V) by the full-scale voltage range, ensuring that the meter safely and accurately measures the voltage without drawing too much current from the circuit.

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