Let's discuss how to convert VA to kW
First, we will see what is VA?
The volt-ampere is the electrical unit that is used for measuring an apparent power in the electric circuit. Apparent power is equal to the product of the root mean square RMS voltage and the RMS current. In a direct current circuit, the product is always equal to an active power in watts. Volt amperes are used for the context of all alternating current circuits. The volt-ampere is geometrically equivalent to watt. In the SI units, 1VA = 1Nms -1 = 1W. The VA rating is mostly used in rating the wires, switches, and some other power of handling equipment so for inductive load.
The actual power is always equal to an apparent power for a purely resistive load. Where the reactive, inductive or capacitive components are present in the load, and apparent power is greater than real power because current and voltage are not in phase in the circuit. When a limiting case for the purely reactive loads and capacitive load, and the current is been drawn into, power is not dissipated into the load.
Many of the electrical devices which are included in the uninterruptible power signals and supplies have ratings of both the maximum volt-ampere and maximum watt of electricity. VA rating has been limited by a maximum and permissible current. Then watt rating is calculated by the power handling capacity for any device. When the UPS power equipment presents the reactive loads with less power factor and apparent value of the electricity, the limit may not safely be exceeded into the value.
For example, the large space of UPS system rating to deliver 300000-volt ampere at 230 volts can be delivered into the current of 1717 amperes.
The Volt-ampere rating is often used for the transformers, the maximum output of the current is converted into the VA rating and is divided by the nominal actual output voltage. When the transformers of the same size are core usually have the same VA rating.
When the convention of the volt-ampere is to distinguish the apparent power from the real power has to be allowed by the SI standard of electricity.
When the electric power transmission and distribution in the circuit, volt-ampere reactive VAR is a unit of measurement of the reactive power. The reactive power exists in an alternating current circuit when the current and voltage are not in the same phase. The term VAR was proposed by the European electrical engineer Constantin bureau from Romania and introduced in the 1930s by the IEC in Stockholm, which adopted the unit for the reactive power in the circuit.
When the special instruments so-called VAR meters are available now to measure the actual reactive power in the circuits.
When the unit VAR is allowed by the International System of Units SI even though the unit VAR is representative of a form of actual power. The SI is to allow one to specify the units to indicate the basic and common sense of physical considerations. Per unit EU directive 80 or 181 or EEC, the metric directive and the correct symbol is lower-case VAR although the spelling is Var and VAr are commonly seen as, and VAR was widely used throughout the power electronics industry.
The volts and amperes are measures for the electricity in the circuits.
A volt is a unit of electric potential difference and the size of the force that sends the electrons through a circuit through the line in the electric field.
An ampere is a unit used to measure electric current. Current is the count of the number of electrons flowing through a circuit. The one ampere is the amount of current produced by a force of one volt that acts through the resistance of one ohm in the circuit.
An ohm is a way of measuring resistance. A certain length of copper wire, which is a good conductor, has a resistance of .00000118 ohms, while the same length of sulfur, which is a very poor conductor, is much more resistant. It has a resistance of 2000 ohms
The four most basic physical quantities in electricity are:
• Voltage V
• Current I
• Resistance R
• Power P
All of these quantities are measured by using different units:
• Voltage is measured in volts V
• Current is measured in amps A
• Resistance is measured in ohms Ω
• Power is measured in watts W
Electrical power, or the wattage of an electrical system, is always equal to the voltage multiplied by the current of the system.
Let us take the system of water pipes is often used as a methodology to help the public understand how these units of electricity work together. In this methodology, the voltage is equivalent to the water pressure, the current is equivalent to the flow rate and the resistance is equivalent to the pipe size of the system.
In electrical and electronics engineering, there is a basic level equation that explains how voltage V, current I, and resistance R relate to the system. This equation, written below is known as Ohm’s law.
Ohm’s Law V = I x R
Ohm’s law, states that V is equal to the I flowing in a circuit times the R of the circuit.
One way of understanding Ohm’s law has to apply it to the imagination plumber system we have employed as a representor of an electrical system.
Let us say, we have a tank of water flow attached to the hose. Suppose, If we increase the pressure in the water tank, more water will become out of these hoses. so, if we increase the voltage in an electrical circuit system, we will also increase the current in the electrical system.
Let us make the diameter of the hose small, resistance will decrease, causing less water to come out of these hoses. so, if we high the R in an electrical system, we reduce the current.
Now, we discuss the KW?
Kilowatt definition
kW stands for kilowatt. A kilowatt is called a thousand watts, which is a measure of P. A kilowatt-hour (kWh) is a measure of energy in the electrical system. So the thousand-watt drill needs a thousand watts one kW of power to make it work and it uses one kWh of energy in one hour.
One kilowatt kw is equal to the 1000 watts
1kW = 1000W
A-One kilowatt is defined as the energy consumption of a thousand joules for one second:
1killowatt = 1000 joules / 1seconds
One kilowatt is equal to 1000000 milliwatts
1killo-Watt = 100000milli-Watt
When you get your electricity bills, what do you look at in that bill, obviously most of ours just look at the total cost to make sure we have not built up a large amount balance. Just you may check the meter readings to make sure they match the ones on your meter in your house. can do you ever look deeply at the number of kilowatt-hours kWh you have used so do you know what it means and dealing?
Do you know what a kilowatt and kilowatt-hour are, which can help you remember!
• How can your energy supplier works out your bills?
• Why do some of the appliances use much more electricity than others and how much individual appliances are in use
• Why should we turn all appliances off at the wall to save energy costs, and not just leave them in the standby position. You can then use that information to help you monitor your gas and electricity use, cut costs and lower your bills.
This is also a good path to make really get accurate comparisons to let we and you’re thinking of switching the gas or electricity provider, or if you want to check you’re getting a good deal because you can look at the exact cost of electricity per kWh – and then do the same for gas and electricity.
What is exactly a kilowatt-hour?
The kilowatt-hour kWh is a measure of how much energy you are now using.
That does not mean the number of kilowatts we are using per hour. This is simply a unit of measuring that equals the amount of energy we would use if you keep a 15000-watt appliance running for an hour
if you switched on a 150-watt light bulb, which would take 11 hours to rack up 1.2 kWh of energy. Or else 2,500-watt appliance would use 1.5 kWh in just half an hour.
When a 55-watt item would stay on for the 22 hours before it used 1.5 kWh.
What else takes around 1 kilowatt-hour?
It is difficult to be precise because similar appliances can have very different wattages, but here are some rough examples of 2 kWh:
• Using an 11,000-watt electric shower for seven minutes
• Keep an immersed heater of 4,000 watts on for 22 minutes
• When we have a 3,000-watt oven for more than half an hour
• When you iron for an hour with a 2,000-watt iron or 35 minutes with a 1,600-watt iron
• Keep less than an hour using your dishwasher 1,200 – 1,600 watts
• Keep around three hours watching a led TV 285 – 460 watts
• Keep your fridge-freezer at 220 – 420 watts on for about 4 hours
• Keep your electric blanket 135 – 250 watts on all night and day
• Using your laptop 25 – 55 watts all over the day
• Keep your broadband router at 8 – 12 watts on for 6 days
Now, let's discuss how will we convert apparent power in volt-ampere VA to the real power in the kilowatts in the circuit.
Volt-amps to the kW calculation of this formula
The calculation is as below
P = S × power factor / 1000
then kilowatts are equal to the volt-amps times the power factor divided by 1000.
kw = volt-amps × power factor / 1000
Example
Let me tell you the real power in kilowatts when the apparent power is 2000 VA and the power factor is 0.81?
Answer
P = 2000VA × 0.81 / 1000 = 1.62kW
