What is the value of resistance of an ideal voltmeter

Table of Contents • • • • • • • • What is the resistance of an ideal ammeter Why? An ideal ammeter is an ammeter whose resistance is zero thus giving the user zero error in measurement. Practically there is no such conductor whose resistance is zero. What is the resistance of an ideal ammeter? For the ideal case, resistance of an ammeter is zero. Why is the resistance of an ideal ammeter zero? The resistance of an ideal ammeter should be zero. This is because an ammeter is connected in series in a circuit. This would decrease the amount of current flowing through the circuit. Hence, in order to avoid the change of current flowing in a circuit. READ: Why didnt they just get the time Stone? What is the value of resistance for ideal voltmeter and ideal ammeter? Answer. The internal resistance of an ideal voltmeter is infinity and the internal resistance of an ideal ammeter is zero. What is the resistance of an ideal resistance? Ideal value of resistance is zero. This indicates that there has to be no power loss and zero voltage drop across the resistor. What does ideal ammeter mean? zero resistance The current measured by ammeter will be accurate if there is no change in current of the circuit by the use of ammeter in series of circuit. It is possible if resistance is called ideal ammeter. Thus, an ideal ammeter has zero resistance. Why is the resistance of an ideal voltmeter infinite? A voltmeter is used to measure the potential difference across the two points of a circuit....

Step 1: Voltmeter • Voltmeter is a device used to measure potential difference across two points and is connected in parallel. • An ideal voltmeter should have infinite resistance because to measure the potential difference all the current should pass through the resistor and no current should pass through voltmeter for precise readings. Because for infinite resistance the flow of current is zero. Step 2: Ammeter • Ammeter is device used to measure current and is connected in series. • To measured accurate current, there must be no change in current of the circuit by the use of ammeter in series of circuit. • This is possible only when ammeter has no resistance. Hence, An ideal voltmeter have infinite resistance, and an ideal ammeter has no resistance for accurate measurement of potential difference and current.

Consider an analog voltmeter. I understand that the internal resistance of the voltmeter should be high enough to not lower the actual voltage across the load connected to the voltmeter, but, at the same time, if the resistance was infinite, there will be no current flowing through the voltmeter which means no magnetic field will be produced and the pointer wouldn't deflect. \$\begingroup\$ @ilkkachu so what I should understand by the word 'ideal' in the context of this analog voltmeter is that (ideally) no current is supposed to flow through the voltmeter and, consequently, there's no voltage drop across the load, but in real life current has to flow into the voltmeter so there must be a voltage drop; however, designers try their best to minimize the amount of current flowing through the voltmeter by choosing the appropriate resistance. Am I correct? \$\endgroup\$ Your reasoning is correct if you take “voltmeter” to mean imagine taking that measurement without disturbing the circuit. The whole idea of an ideal instrument of any sort is to ignore the limitations of a physical implementation of the concept; there does not have to be a possible way to do it. That said, there are ways to measure DC voltage with a nearly infinite input impedance. • The The electrostatic voltmeter electrically resembles a capacitor, so its input impedance is infinite at DC (if you ignore leakage across insulators). If you remove it from a circuit, the needle will keep its reading unless you sho...

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer See Answer See Answer done loading Question:Knowing that to measure voltage you need to connect a voltmeter between two points of a circuit and that the voltmeter should have little • Knowing that to measure voltage you need to connect a voltmeter between two points of a circuit and that the voltmeter should have little effect on the circuit, what do you think is the value ofthe voltmeter internal resistance, high or low? What is the resistance of an ideal voltmeter which does not influence a circuit at all (does not draw any current)? A real voltmeter can be represented by a circuit consisting of an ideal voltmeter and a resistor representing its internal resistance. Draw the schematic of that circuit, indicating terminals which represent leads used for voltage measurements. Write an equation for finding the unknown voltmeter internal resistance R int if you know the value of the resistor R and the voltage V s in experiment 1.1 of this laboratory( Fig 4.1). • Draw an equivalent circuit of a real ammeter, consisting of an ideal instrument and the internal resistance. Again, a good instrument should have a minimal effect on a circuit being measured. Remember that, unlike a voltmeter, an ammeter connects in series with the measured circuit. So, an ideal ammeter should not resist current flow and should not develop any voltage across its ter...

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For the sake of expirementing, as far as I have tested (with simulators online) connecting an ohmmeter in parallel with the single component in a closed circuit with a generator short circuits, concluding that the resistance of an ohmmeter is ideally 0, right? I have found no conformation nor information about this online, but what made me wonder even more is an ohmmeter acts as a voltmeter that exports power, and voltmeters having ideally $\infty$ power, so an ohmmeter having no resistance didn't make much sense, perhaps because it is the source of the energy it does not require resistance? Current leaves and enters through it, doesn't pass through it. I have absolutely no idea how resistance works with components producing energy so bare with me here! Like, does a generator have resistance as well (well a simple google search says yes), and why? No electricity goes through it I think. And perhaps ultimately an ohmmeter and a generator don't relate in terms of resistance, sharing the common aspect of producing energy doesn't affect that. $\begingroup$ I don't think it's obvious what "ideal" means for an Ohm meter, but I'm pretty sure that your average, bench-top Ohm meter (a) is only intended to measure the resistance of a component that has been isolated from any circuit, and (b) delivers power to the the component when it is being used as intended. $\endgroup$ An ohmmeter is • supplying power to a circuit and • comparing the voltage across two legs of the circuit (a ref...

An IDEAL voltmeter would measure the voltage at the test point without becoming a part of the circuit. The only way to not become any part of the circuit at all is to have an infinite resistance, in other words, infinity Ohms. (In the case of an alternating current, substitute the word impedance for resistance, above.) Neither a total vacuum nor any physical material exhibits infinite resistance, so there is no such thing as an IDEAL voltmeter. Further, it would be difficult to transmit an electrical signal across a test probe with an infinite resistance, so again, no such thing. In my opinion, a QUALITY voltmeter has a impedance of 10 million (10M) Ohms or more. What is the use of universal high resistance voltmeter? A voltmeter must have a very high resistance to measure voltage. A voltmeter is placed in parallel with the element that you are measuring. If the voltmeter has a low internal resistance, then all of the current will flow through the voltmeter instead of the element. You want all of the current to flow through the element, to get an accurate reading of the voltage. Conversely, an ampmeter must have zero resistance, because it is placed in series with the element. What should be the resistance of an ideal current measuring instrument? Ideal current measuring instrument should have zero resistance. The ammeter is added in series and hence it should not load the circuit. Voltmeter on other hand should have infinite impedance so that it can used at places where c...