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The difference between upscale and downscale results in an instruments response when subjected to the same input approached from opposite directions is known as?
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∙ 12y ago
Hysteresis
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∙ 12y ago
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Why are moving iron instruments unpolarized?
Moving-coil instruments are polarised, not unpolarised. This is because they are direct current instruments, and the direction of the current determines the direction in which the instrument's point will move. If a moving coil instrument is connected incorrectly, then the instrument will try and read 'downscale' -in other words, the resulting torque will try and move the pointer backwards.AnswerA moving-iron meter operates by the repulsion between a fixed iron pole piece, and a moving iron pole piece to which the pointer is attached. The magnetic polarity of the fixed and moving pole pieces is determined by the direction of current flowing though a coil. The magnetic polarities induced into the fixed and moving iron pole pieces, when the current flows in one direction, are both north; and, when the current flows in the oppositedirection are both south. So the pole pieces always repel each other, regardless of current direction.
How wattmeter is connected in circuit?
A wattmeter has two coils: a current coil and a voltage coil. The current coil is connected in series with the load, while the voltage coil is connected in parallel with the load (just in the same way an ammeter and a voltmeter are connected). The wattmeter's polarity markings must be observed while making these connections -if the wattmeter reads 'downscale' (backwards), then the connection to either one (but not both) of the coils must be reversed.
What happens to the meter reading when you invert the direction of the arrow on the current transformer of power meter?
The wattmeter will read downscale (backwards).
Why are moving iron instruments unpolarized?
Moving-coil instruments are polarised, not unpolarised. This is because they are direct current instruments, and the direction of the current determines the direction in which the instrument's point will move. If a moving coil instrument is connected incorrectly, then the instrument will try and read 'downscale' -in other words, the resulting torque will try and move the pointer backwards.AnswerA moving-iron meter operates by the repulsion between a fixed iron pole piece, and a moving iron pole piece to which the pointer is attached. The magnetic polarity of the fixed and moving pole pieces is determined by the direction of current flowing though a coil. The magnetic polarities induced into the fixed and moving iron pole pieces, when the current flows in one direction, are both north; and, when the current flows in the oppositedirection are both south. So the pole pieces always repel each other, regardless of current direction.
How do you find the voltage at a point in a circuit with respect to a negative voltage?
First of all, 'voltage' means potential difference -and you cannot have a potential difference 'at a point'. Similarly, you cannot have a 'negative' potential difference, so it doesn't make sense to talk about a 'negative voltage'.Your question, therefore, should read: 'How do you find the potential at a point in a circuit with respect to a negative potential?'The answer is that you simply connect a voltmeter between the two points. The reading will give you the value of the potential. If it reads upscale, then it'll be positive; if it reads downscale, then it will be negative (i.e. even more negative tan the reference potential).
Is it ok to have the dot on a current transformer upside down?
You are probably referring to a 'polarity mark'. This is very important if the CT's burden requires current to flow through it in a particular direction in order to work properly. For example, it won't make any difference if the burden's an ammeter. But if the burden is, say, a wattmeter, then it's very important to observe the CT's polarity mark when it is wired, otherwise the wattmeter might read 'downscale' (backwards). It's also very important when the CT supplies protection relays.
Can you connect pressure coil instead of current coil in watt meter to measure power?
You have to connect both coils to measure power: the current coil in series with the load, and the voltage ('pressure') coil in parallel with the supply. And you have to observe the wattmeter's polarity markings if you don't want it to read downscale (backwards)!
How do you connect the wattmeter to measure the active power?
The voltage coil must be connected between the line conductor and the neutral conductor. The current coil must be connected in the line conductor. The instrument's polarity markings must be observed -if the meter reads 'downscale' (backwards), then you need to reverse the connection of one of the coils.
Can exaggeration be used to massively downscale rather than up?
Yes. For example, it's usually an exaggeration to describe someone as having absolutely no social skills. Similarly, if you say, "When I was growing up, we had no money," that is most likely an exaggeration. Exaggerations of this type are common in insults, such as, "He couldn't fight his way out of a paper bag."
How the current and pressure coils of the wattmeer are connected in circuit to measure the power drawn by load?
The current coil is connected in series with the load. The voltage coil (the term, 'pressure coil' is rather archaic!) is connected in parallel with the load. The wattmeter's polarity markings must be taken into account, or the meter will read downscale (backwards).
What are some nine letter words with 3rd letter W and 5th letter S and 6th letter C?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern --W-SC---. That is, nine letter words with 3rd letter W and 5th letter S and 6th letter C. In alphabetical order, they are: downscale townscape
What will happen when the terminal of the volmeter are inversed and used to read the voltage of the DC supply?
Depends on the voltmeter. Some meters will display a positive voltage no matter how the leads are attached to the source. Others may indicate a negative voltage if leads are reversed.Another AnswerAn analogue voltmeter will always read downscale (i.e. 'backwards') if connected the wrong way around.Digital voltmeters generally indicate the correct voltage, but display a negative sign to indicate that the polarity is the wrong way around.Don't forget, when we say 'negative voltage', we are referring to its direction. Voltage, which is simply another word for 'potential difference', and it cannot be positive or negative in the sense of 'charge'.
What GMRT do after receiving signal?
I persume you mean the Giant Meterwave Radio Telescope (GMRT) in India. The way a received signal is processed is equivalent to the working principle of a double-super-heterodyne-receiver. That means that a received signal is filtered, mixed with another frequency and filtered again to downscale it for transport from telescope antenna to the observation room...here it is mixed and filtered again so that the signal is be downconverted for recording and data analisys.
How wattmeter is connected in circuit?
A wattmeter has two coils: a current coil and a voltage coil. The current coil is connected in series with the load, while the voltage coil is connected in parallel with the load (just in the same way an ammeter and a voltmeter are connected). The wattmeter's polarity markings must be observed while making these connections -if the wattmeter reads 'downscale' (backwards), then the connection to either one (but not both) of the coils must be reversed.
