Although an ideal voltmeter has an infinite internal resistance, this theoretical ideal is usually not met in
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 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?
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We can find the initial voltage across the resistor without the voltmeter attached and then with the ...View the full answer
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Related Book For 
College Physics Reasoning and Relationships
ISBN: 978-0840058195
2nd edition
Authors: Nicholas Giordano
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