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Wattmeter
Definition
The wattmeter is an instrument for measuring the electric power (or the supply rate of electrical energy) in watts of any given circuit.Electric power is measured by means of a wattmeter. This instrument is of the electrodynamic type. It consists of a pair of fixed coils, known as current coils, and a movable coil known as the potential coil. The fixed coils are made up of a few turns of a comparatively large conductor. The potential coil consists of many turns of fine wire. It is mounted on a shaft, carried in jeweled bearings, so that it may turn inside the stationary coils. The movable coil carries a needle which moves over a suitably marked scale. Spiral coil springs hold the needle to a zero position.The figure below shows the circuit of a simple wattmeter.
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It will not. This relay is a Normally Open relay construction. The contacts are closed only when power is applied to the relay coil. You must use either an SPST-NC (Single Pole Single Throw – Nor?
It will not. This relay is a Normally Open relay construction. The contacts are closed only when power is applied to the relay coil. You must use either an SPST-NC (Single Pole Single Throw – Normally Closed) construction or an SPDT (Single Pole Double Throw) type of construction so a contact closure is presented when there is no power applied to the relay coil.
Why use two wattmeter to calculate the power of a three phase load?
Two wattmeter method is used in a three phase sysstem to measure the true power without regard to the balance ie. It can be used to measure both balanced loads and unbalanced loads.The three phase power could be measured using single phase wattmeters in each loads of the system. But using three wattmeters is quite unnecessary as we can measure it by using only two wattmeters.The three phase power could be measued by using single phase wattmeters , haing a current coil in one line and a potential coil connected between the line and some arbitrary common junction point. If that arbitrary common point is chosen on one of the three lines, then the wattmeter connected to that line will indicate zero power because it's potential coil has no voltage across it. hence, that wattmeter may be eliminated, and the three phase power can be determined by means of only two single phase wattmeters.
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The burgler's contrivance was very well thought out, he had planned every single detail.
Explain the Two wattmeter method of power measurement in a 3 phase circuit?
A single wattmeter can measure power due to one phase only. But circuit arrangements , popularly called: 1) 2-wattmeter method (requiring two wattmeters) 2)3-wattmeter method (requiring 3 wattmeters) can be used for measuring power inn 3-phase circuit. The details of these method can be found in any standard book on electrical engineering.
State the meaning of multiplying factor of wattmeter and with suitable example explain how it is determined?
watt meter is constructed such that it read only power on a single scale. Only single scale will available to read the measured power. In order to take the accurate reading just we measure the reading and we will multiple along with factor called multiplication factor. That's depends on on which voltage knob we connected and also the current. Multiplication factor can be determined by: Multiplication factor =(voltage range*current range*pf)/Max scale deflection.
Explain the centralized DBMS architecture in detail?
combines everything into a single system including, DBMS software,hardware, application programs and user interface
What is the NAICS code for single-family housing construction industry?
233210 (Single-Family Housing Construction)
What has the author Morton Newman written?
Morton Newman has written: 'Electronic Structural Detail Library' 'Structural details for masonry construction' -- subject(s): Building, Masonry, Details, Drawing 'Standard handbook of structural details for building construction' -- subject(s): Building, Details, Drawings, Handbooks, manuals, Structural drawing 'McGraw-Hill Electronic Structural Detail Library - Single User' 'Structural details for steel construction' -- subject(s): Building, Building, Iron and steel, Details, Drawing, Iron and steel Building
How many workers are employed in the single-family housing construction industry?
About 768,000 workers were involved in general contracting for single-family construction in 2001
Is the data for a single person in a database stored in a row?
Probably. (More detail in the question will generate more detail in the answer. )
What is unique about the single-family housing construction industry?
The single-family housing construction industry is unique for an industry of its size because it is highly fragmented and dispersed.
Does real estate development include the construction of residential single-family houses?
Real estate development includes the construction of residential single-family houses
Why you use upf wattmeter for short circuit test on load test on single phase transformer?
If, by 'upf', you mean 'unity power factor', then allwattmeters measure the in-phase component of the load current, so the term is quiet unnecessary.A short-circuit test is used to determine the (true) power loss in the transformer, which is exactly what a wattmeter measures
How do you defeat the game Pokemon ranger shadows of almia?
I cant trealy explain every single detail but Ive beaten it in only 5days but you can e-mail me at gaggle.net - talyah08r- you can tell me what your on and I'll tell you what to do next when your stuck.
What factors affect the single-family home construction industry?
single-family home construction industry is extremely susceptible to changes in economic factors and financial markets.
What uses a single arc in its construction?
Part of the circumference of a circle
How many businesses and worker are there in the single-family home construction industry?
Traditionally quite fragmented, in 2000 the single-family housing construction industry consisted of 151,296 establishments that employed 713,300 workers
