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EzraA watt meter measures the instantaneous power flow. In an AC power system, this is the product of the Voltage (V) and Current (I) magnitudes which are in-phase with each other. The Power Factor, or the Cosine of the angle (a) between the Current phasor and the Votage phasor, is the ratio of these in-phase quantities. So, a watt meter measures V*I*Cos(a).
A Var meter on the other hand measures Volt-Amperes Reactive, [ V*I*Sin(a) ] that is, the portion of the product of voltage and current which are NOT in-phase. (The term KVar refers to results which are read in 1000 Var increments) Vars cannot produce work, are therefore considered parasitic, and power companies don't like to produce or deliver vars to consumers because they reduce line capacity and cause heating of conductors.
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What is the difference between single phase and three phase voltage measurement?
Phasing, or the number of phases in an electrical system has nothing to do with the voltage. A single phase and three phase supply could have a voltage supply of any given voltage from virtually 0 to infinity. Most single phase power supplies in the US are 120/208-240 volt. Three phase power supplies are typically 120/208 to 277/480 volt.
Does watt meter reading go negative?
Yes!
What is the difference between 1watt 1kilowatt 1megawatt?
1 mega watt is equal to 1 million watt or 1000000 watt.
What is the difference between a watt and sunlight?
Welll, it's actually a lot like the difference between a mile-per-hour and cars,or between an inch and people.-- "Watt" is a unit of measure that describes the rate at which energy is used,or produced, or moved from one place to another.-- "Sunlight" is a small portion of the stupendous amount of energy that the sunproduces and pours out in every direction at a humongous rate.
What are the different between the watt steam engine and the internal combustion engine?
They are completely different engines; however, the most fundamental difference is that the Watt steam engine runs on steam, whereas the internal combustion engine runs on fuel oil.
