If an ideal voltmeter is connected in parallel across a resistor in a simple series circuit, what effect does it have on the circuit's total current?
The total current remains unchanged because the voltmeter draws no current
An ideal voltmeter has infinite internal resistance.
When connected in parallel across a resistor, the current through it is \(I = \frac{V}{\infty} = 0\), so it draws no current.
The equivalent resistance of the resistor in parallel with an infinite resistance is still just the resistor's value, so the total circuit resistance and hence the total current do not change.
It does not provide a new conducting path (no current flows through it), it does not block current (it is in parallel, not in series), and it adds no effective resistance to the circuit.
Hence, the answer is The total current remains unchanged because the voltmeter draws no current.
Similar Questions
A 0–200 V voltmeter has a guaranteed accuracy of ±1% of full-scale reading. If the instrument indicates 50 V, the actual voltage being measured lies between:
An engineer compares two voltmeters. If Voltmeter A has higher sensitivity than Voltmeter B, what is the most likely practical implication?
A voltmeter is connected across a battery in a simple circuit. What does it measure?
A digital voltmeter is required to measure a DC signal with superimposed AC noise. Which type of DVM is most likely to produce the most accurate reading?
Important Questions from Indicating Instruments
Hot wire ammeters are used for measuring
Which one of the following force is not needed for the satisfactory operation of any indicating (or measuring) instrument?
Assertion (A): Shunt of an ammeter has a low resistance
Reason (R): Shunt may be connected in series or in parallel with an ammeter.Which of the following statements are correct?
A. Ultrasonic method for liquid level measurement is not preferred in industrial applications.
B. In a pH meter, the glass electrode is the reference electrode.
C. A chromatograph is used for analyzing the composition of a gas.
D. The production of Korotkoff sounds in indirect blood pressure measurement is due to pressure pulses produced due to the difference in systolic and diastolic blood pressure.
Choose the correct answer from the options given below:
- Which instrument is representing an integrating type instrument?
