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 ammeter has

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In the physics lab, we use many measuring devices to measure various specifications. Some devices used in the lab are voltameter, ammeter, vernier calliper, screw gauge, telescopes and many more. Electricity is measured using devices like ammeter and voltameter. In this article, let us understand and learn about the ammeter and its specification. In the 19th century, the ammeter with the ability of accurate measurements, which could be mounted in any position was invented. Ammeter is a device used to measure either alternating or direct current. We know that ampere is the unit of current. To measure the current, generally the ammeter is connected in series with the circuit. This device is mainly used for measuring a small amount of current, and the current is measured in the milliampere or microampere range. The device which is used to measure the current in milliampere is known as milliammeter, and the device for measuring extremely small electric currents, calibrated in microamperes is called microammeter.

An ideal ammeter has

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. In order to measure the electric current flow through it, an ammeter is placed in series with a circuit element. The ammeter is designed to offer very low resistance to the current, so that it does not appreciably change the circuit it is measuring. To do this, a small resistor is placed in parallel with the galvanometer to shunt most of the current around the galvanometer. Its value is chosen so that when the design current flows through the meter it will deflect to its full-scale reading. A galvanometer full-scale current is very small: on the order of milliamperes.

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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.

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