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How does a watt-hour meter work?
There are a couple of kinds of watt-hour meters: one is an electromechanical type (the one with the spinning wheel), and the other is a solid-state type. The solid-state types generally use a current transformer to measure the current produced in the current-carrying conductors, which means that the current carrying conductors need not be connected to the actual measuring device.) The electromechanical type uses an aluminum disc acted upon by two coils. One coil is positioned in such a way as to produce a magnetic flux in proportion to the voltage on the disc, and the other coil produces a magnetic flux proportional to the current. This causes the disc to rotate at a speed proportional to the power (voltage times current) being used. A permanent magnet is also installed in such a way as to exert an opposing force in proportion to the rotating speed of the disc. This causes the disc to slow down and stop when energy stops being used. The aluminum disc is also attached to a worm gear which drives the register.
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Blood glucose monitors use capillary action to mix a sample of blood with glucose oxidase. This mixture, gluconic acid, mixes with yet another chemical called ferricyanide to …create ferrocyanide. Using electrodes within the test strip, current is applied to the ferrocyanide. The concentration of glucose has a direct effect on the current that is then translated into a measurement that is reasonably accurate.
A watt meter is what the power suppliers have on the side of your house to monitor the use of electricity going into your home. These can also be bought at electrical wholesal…e suppliers. There is a second kind of watt meter that measures in the RF frequencies. It is connected into the coxial cable on the output side of a transmitter. These can be purchased at radio shops that sell amateur radio equipment. Additional Answer Actually, what you have on the side of your house to monitor your use of electricity is an energy meter, not a wattmeter. Wattmeter are used to measure power. Your electricity meter is used to measure energy, expressed in kilowatt hours.
The metallic disc is acted upon by two coils. One coil is connected in such a way that it produces a magnetic flux in proportion to the voltage and the other produces a magnet…ic flux in proportion to the current. The field of the voltage coil is delayed by 90 degrees using a lag coil. This produces eddy currents in the disc and the effect is such that a force is exerted on the disc in proportion to the product of the instantaneous current and voltage. A permanent magnet exerts an opposing force proportional to the speed of rotation of the disc - this acts as a brake which causes the disc to stop spinning when power stops being drawn rather than allowing it to spin faster and faster. This causes the disc to rotate at a speed proportional to the power being used.
BTU meters measure the energy content of liquid or gas flows in British thermal units (BTU), a basic measure of thermal energy. One BTU is equal to the amount of energy ne…eded to heat one pound of water one degree Fahrenheit.
By using gravity force, a flow meter has many functions. One function is measuring lung capacity and another is measuring fluid by ultra waves. There are various types of flow… meters and quit hard to narrow one down.
Q-meter works on the principle of Series Resonance
A pH meter is the same as a voltmeter, look up them for more information.
A Creep Meter uses a wire stretched across a fault to measure horizontal movement of the ground.
What is the difference between the watt hour meter and Var hour meter in terms of internal connection and work theory ie When the meter records watt-hour an when the meter records var hours?
Only watts (power) can produce work (energy) because of the phase relationship of the voltage and current in an alternating current, electric power system. With watts, the por…tion of the current and voltage that are in-phase with each other can do work. Vars, on the other hand are volt-amps reactive, which are out-of-phase with each other. Since Vars cannot do work, their existence in the electric power system is parasitic. The reactive current which flows in a power line, for instance uses a portion of line capacity, and also causes heating (I^2 * R power loss) due to the inherent resistance of the conductors. So, in the construction of a simple electromechanical meter, measuring Watt-hours or Var-hours, the respective current and voltage coils used to drive the rotating disk are situated to produce torque. For a Var Hr meter, the coils are rotated 90 degrees relative to each other to counter the lagging or leading phase shift and thus produce torque.
Instrument used to detect and measure electrical current. A coil of wire pivoted between the poles of a permanent magnet is turned by the motor effect of an electric cur…rent (by which a force acts on a wire carrying a current in a magnetic field). The extent to which the coil turns can then be related to the magnitude of the current. The sensitivity of the instrument depends directly upon the strength of the permanent magnet used, the number of turns making up the moving coil, and the coil's area. It depends inversely upon the strength of the controlling springs used to restrain the rotation of the coil. By the addition of a suitable large resistor, a moving-coil meter can be adapted to read potential difference in volts. A simple moving-coil meter. Direct electric current (DC) flowing through the wire coil combined with the presence of a magnetic field causes the coil to rotate; this in turn moves a pointer across a calibrated scale so that the degree of rotation can be related to the magnitude of the current.
A watt is the electric unit of power. Amperage x voltage = watt. 746 watts is one horsepower. A wattmeter measures power. Answer A wattmeter measures the voltage appli…ed to a circuit, the resulting current, and the cosine of the angle between them, allowing it to indicate the true power of a circuit, in watts, regardless of the nature (resistive, inductive, or capacitive) of its load. Incidentally, the watt is the SI unit for power, it is not the 'electric unit' of power, as there is no such thing as 'electric power'.
There are many electrical meters, please be more specific.
it meters how much fuel is being injected into the turbocharger at max boost around 55psi (low boost) and if there is to much fuel it sets of a warning
a DC clamp meter works on the principals of what is called "Hall Effect." The meter creates a magnetic field, and the DC voltage passing through the wire interacts to crat…e a meter reading.
There are many different types of watt-hour meters. They generally count the usage from when they are first installed. Older models use dials for each power of ten, more moder…n versions use a display that directly reads the kilowatt-hour value.