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the difference is that the former is fitted with some type of registration mechanism whereby all the instantaneous reading of power are summed over a definite period of time whereas the latter indicates the value at particular instant when it is read.
A 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.
KVAR is reactive power only; KVA is the vector sum of KVAR and KW
KVA^2 = KVAR^2 + KW^2
KVA = KW + jKVAR
KVA is full power, which includes the real power component (watts, or kW), and the reactive component (VARs, or kVAR).
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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.
What is the relation between Newton meter and watt?
1 Watt = 1 Joule / Second = 1 Newton-meter / Second.
What does the difference between 60-watt and a 100-watt light bulb describe?
power difference
What difference between RF power output watt and electrical power output watt?
The difference is in the output frequency.
How many voltmeter and ammeter are in dc watt meter?
There is no volt meter or amp meter in a DC watt meter.
Why you reset the zero point on the watt meter?
So that the result that you find on the watt meter after resetting it will be accurate
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.
What it is the difference between 100 watts and 75 watt light bulb?
The main difference between a 100-watt and a 75-watt light bulb is the amount of light output they produce. A 100-watt bulb will be brighter and consume more energy compared to a 75-watt bulb. The 100-watt bulb may also generate more heat than the 75-watt bulb.
What is the difference between 35 watt and 50 watt h.i.d. lights?
The main difference between 35 watt and 50 watt HID lights is the power consumption and light output. A 50 watt HID light will consume more power and produce brighter light compared to a 35 watt HID light. The choice between the two would depend on the specific lighting needs and preferences.
What is a meter socket?
The electrical power that you use from the utility company has to be metered. This is done with a plug in watt meter. The meter socket is what holds the electrical watt meter. It is this meter that the meter reader reads to give you your monthly billing for the electricity that you used.
What does difference between Watt and Volt ampare?
No difference in case of DC. In case of AC Watt refers to Power which includes the factor of power factor. VA does not include power factor.
What is the difference in cooking times between 1100 watt and 700 watt microwaves?
In general, a 1100 watt microwave will cook food faster than a 700 watt microwave. The cooking time difference will vary depending on the specific dish being prepared, but as a guideline, you can expect the 1100 watt microwave to cook roughly 50% faster than the 700 watt microwave.
What does the difference between a 60 watt and a 100 watt bulb describe?
The difference between a 60 watt and a 100 watt bulb is the amount of power each consumes and the brightness they produce. A 100 watt bulb consumes more energy and therefore produces more light than a 60 watt bulb. This can impact the brightness and energy efficiency of the lighting.
