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Voltmeter Sensitivity Formula:
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Voltmeter Sensitivity refers to the ability of a voltmeter to detect small changes or variations in voltage. It is typically expressed in ohms per volt (Ω/V) and indicates the internal resistance of the voltmeter per unit of full-scale voltage.
The calculator uses the Voltmeter Sensitivity formula:
Where:
Explanation: The sensitivity is inversely proportional to the full-scale deflection current. A lower full-scale current results in higher sensitivity.
Details: Higher sensitivity voltmeters have less loading effect on circuits being measured, providing more accurate voltage readings, especially in high-impedance circuits.
Tips: Enter the full-scale deflection current in amperes. The value must be greater than zero for accurate calculation.
Q1: What is a typical sensitivity range for analog voltmeters?
A: Analog voltmeters typically have sensitivities ranging from 1,000 Ω/V to 50,000 Ω/V, with higher values indicating better sensitivity.
Q2: How does sensitivity affect voltage measurement accuracy?
A: Higher sensitivity means the voltmeter draws less current from the circuit, resulting in more accurate measurements with less circuit loading.
Q3: What's the difference between analog and digital voltmeter sensitivity?
A: Digital voltmeters typically have much higher input impedance (10 MΩ or more) compared to analog meters, making them less loading on circuits.
Q4: Can I use this formula for both AC and DC voltmeters?
A: This formula applies primarily to DC voltmeters. AC voltmeters may have different sensitivity characteristics due to rectifier circuits.
Q5: How does full-scale deflection current relate to meter movement?
A: The full-scale deflection current is determined by the meter movement's characteristics and is the maximum current that causes the pointer to deflect to the full scale.