Explain working of ammeter, Electrical Engineering

Assignment Help:

Q. Explain working of Ammeter?

In order to measure the current through a wire or line of a circuit, an ammeter is connected in series with the line. A practical ammeter can usually be modeled as a series combination of an ideal ammeter and an internal resistance RI. The potential difference between the two terminals of an ideal ammeter is zero, which corresponds to zero internal resistance. There are what are known as dc ammeters and ac ammeters. An ac ammeter usually measures the rms value of the time-varying current. Note that for the ammeter to be inserted for measuring current, the circuit has to be broken, whereas for the voltmeter to be connected for measuring voltage, the circuit need not be disassembled.

Multimeters that measure multiple ranges of voltage and current are available in practice. Ohmmeters measure the dc resistance by the use of Ohm's law. A multimeter with scales for volts, ohms, and milliamperes is known as VOM. An ohmmeter should not be used to measure the resistance of an electronic component that might be damaged by the sensing current.


Related Discussions:- Explain working of ammeter

State the principle of working of transformer, a) State the principle of wo...

a) State the principle of working of transformer. b) A 230/110 V, single-phase transformer takes an input of 350 volt-amperes at no load while working at rated voltage. The core

Machine control instructions , Machine Control Instructions Instructio...

Machine Control Instructions Instructions used to control  various machine operations are kept  in this group.

Define electric current, Define Electric current If an electric pressur...

Define Electric current If an electric pressure or voltage is applied across any material there is a tendency for electrons to move in a certain direction. This movement of fre

Pareto Analysis, Pareto Analysis Pareto charts are based on the princi...

Pareto Analysis Pareto charts are based on the principle - "Vital Few Trivial Many". It allows user to focus attention on a few significant factors in a process. It is very us

Live human detection robot, which simulation software is better for this p...

which simulation software is better for this project, and how can i simulate it?

Find the induced emf across the coil, Q. A coil is formed by connecting 15 ...

Q. A coil is formed by connecting 15 conducting loops, or turns, in series. Each loop has length l = 2.5 m and width w = 10 cm. The 15-turn coil is rotated at a constant speed of 3

What do you mean by mantissa, Q. What do you mean by Mantissa? The man...

Q. What do you mean by Mantissa? The mantissa , as well known as the significand , represents the precision bits of the number. It is composed of an implied leading bit and t

Responses to exponential excitations, Responses to Exponential Excitations ...

Responses to Exponential Excitations Let us consider Aest as a typical exponential excitation in which A is a constant and s is a complex- frequency variablewith a dimension of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd