Although an ideal voltmeter has an infinite internal resistance, this theoretical ideal is usually not met in practice The voltmeter in Figure P19 76 has an internal resistance of 10 9 and is used to measure the voltage across a resistor with R 2 150 k as shown How much does this nonideal voltmeter affect the circuit That is, attaching the voltmeter changes the voltage across R 2 What is the fractional change in the voltage across R 2 when the voltmeter is attached R1 R2 Figure P19 76

Question: Although an ideal voltmeter has an infinite internal resistance, this theoretical ideal is usually not met in practice. The voltmeter in Figure P19.76 has an

Although an ideal voltmeter has an infinite internal resistance, this theoretical ideal is usually not met in practice. The voltmeter in Figure P19.76 has an internal resistance of 10⁹ Ω and is used to measure the voltage across a resistor with R₂ = 150 kΩ as shown. How much does this nonideal voltmeter affect the circuit? That is, attaching the voltmeter changes the voltage across R₂. What is the fractional change in the voltage across R₂ when the voltmeter is attached?

R1 R2- Figure P19.76

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