An ideal ammeter has

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Hence, An ideal voltmeter have infinite resistance, and an ideal ammeter has no resistance for accurate measurement of potential difference and current. Byju's Answer. Why should an ideal voltmeter have infinite resistance, and an ideal ammeter has no resistance? Open in App. 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.

An ideal ammeter has

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An instrument used to measure currents is called an ammeter. To measure the current in a wire, you usually have to break or cut the wire and insert the ammeter so that the current to be measured passes through the meter. An ammeter always measures the current passing through it. An ideal ammeter would have zero resistance, so including it in a branch of a circuit would not affect the current in that branch. Real ammeters always have some finite resistance, but it is always desirable for an ammeter to have as little resistance as possible. The principle of operation of ammeters is based on the interaction between an electric current and a magnetic field. Ammeters are typically designed as a low-resistance device that is placed in series with the circuit being measured. When an electric current flows through the ammeter, it generates a magnetic field around the ammeter.

An ideal ammeter has

However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as electrons flow through it. Note that this ideal resistance value is exactly opposite as that of a voltmeter. With voltmeters, we want as little current to be drawn as possible from the circuit under test. With ammeters, we want as little voltage to be dropped as possible while conducting current. Placing the same ammeter in the right branch would affect the current to an even greater extent:. Now the right branch current is 1 amp instead of 1.

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Electrical currents are then measured in the form of amperes, hence the name, "ammeter". The term "ammeter" is sometimes used incorrectly as "ampmeter". Ammeters are designed, as well as ohmmeters and voltmeters , to be used with the use of a sensitive current detector such as a moving coil in a galvanometer.

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