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A moving-coil ammeter is an analogue ammeter, used to measure direct current. It works on the same principle as an electric motor, whereby a pivoted coil, located between the two poles of a horseshoe magnet, will rotate when current is passed through it. The movement is restricted by a pair of hairsprings, which means that the moving coil will move through an angle that is proportional to the current. A pointer, attached to the coil, sweeps across a suitably-graduated scale, to indicate the value of current passing through the coil.
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What are the kinds of ammeter?
The ammeter is a device that measures the electric current. Hot wire, electrostatic, moving iron, moving coil, and induction are the kinds of ammeter.
A moving coil galvanometer can be used as an ammeter by adding?
a series resistence with its coil
What does mc and mi refer to in voltmeter and ammeter?
moving coil & moving iron
Moving coil galvanometer converted into a multi range ammeter?
yes
Working principle of ammeter?
An ammeter consists of a coil with very low resistance. when electric current flows through the coil, the coil induces a magnetic field which turns the needle.
What is the purpose of the series resistor in your designed ammeter circuit?
You appear to be referring to a 'swamping resistor' which is connected in series with a moving-coil ammeter's moving coil.To minimise any errors due to temperature changes in the resistance of the instrument's moving coil, the coil is connected in series with what is termed a 'swamping resistor' whose resistance is large in comparison with that of the moving coil, and which is manufactured from an alloy with a very lowtemperature coefficient of resistance (i.e. a metal whose resistance is hardly effected by wide variations in temperature).For example, if the resistance of a 1-Ω moving coil increases to, say, 1.1 Ω, when its rated current flows through it, this will introduce a 10% error in the instrument's reading.But by calibrating the instrument with a series swamp resistor of, say, 49 Ω, the overall resistance at rated current will become 50.1 Ω. This will result in an error of just 0.2%.A swamping resistor, then, is an integral part of all moving-coil instruments and, when we refer to an instrument's 'coil resistance', we actually mean the combined resistance of the moving coil itself and its swamping resistor.
What is MI in ammeter MI?
mi stands for moving iron in ammeter used only in alternating current circuits
Why wouldn't the shunt resistor in the ammeter protect the ammeter when the ammeter is connected in parallel?
Connecting an ammeter in parallel subjects that ammeter to the full supply voltage. The shunt resistor is not designed to sustain that value of voltage and will burn out. Also, the clue is in the word 'shunt' (which means 'in parallel') which means that the coil will also burn out!
What is the construction and working details of moving iron and moving coil ammeters and moving coil voltmeters?
Different b/w a moving coil instrument and a moving iron instrument
How is the ammeter reading when the magnet is pushed slowly into the coil?
You have to do the experiment you have been asked to do to find out.
What is a DC ammeter and how does a DC ammeter work?
An ammeter is an instrument designed to measure electric current, which is expressed in amperes. A d.c. ammeter is one that will measure direct current (d.c.), as opposed to alternating current (a.c.). Ammeters are rarely used outside laboratories. Instead, multimeters are more commonly-used, and these will measure d.c. or a.c current and voltage, together with resistance. In other words, a multimeter functions as an ammeter, a voltmeter, and an ohmmeter. The principle of operation of a digital ammeter is too complicated to explain in this forum. An analogue ammeter works by a rotating coil to which is attached a pointer. The coil is balanced between two hairsprings and located between opposite faces of a permanent magnet. When current passes through the coil, the resulting magnetic field reacts with the permanent magnetic field, causing the coil to rotate, tightening the hairsprings. When the torque due to the current matches the opposing torque due to the hairsprings, the coil will stop turning. The position of the pointer on a scale will then indicate the current passing through the ammeter.
Is Voltmeter is a moving iron Instrument or moving coil instrument?
If this is a homework related question, you really should consider trying to solve it yourself before looking at this answer. Otherwise, the value of the lesson, and the reinforcement provided by the assignment, will be lost to you.A moving coil measuring instrument has a coil attached to the indicator, surrounded by a magnet.A moving iron measuring instrument has a magnet attached to the indicator, surrounded by a coil.In both cases, the indicator is driven by magnetic torque caused by current flow in the coil.
