In this content let we discuss how to convert VA to kW
First, we will see what is VA?
The volt ampere is the electrical unit which is used for measuring an apparent power in the electric circuit. An apparent power is equal to 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 a context of all alternating current circuit. The volt ampere is geometrically equivalent to watt. In the SI units, 1VA = 1Nms -1 = 1W. The VA rating are 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 into the load, and an apparent power are more greater than to a 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, but power is not dissipated into the load.
Many of the electrical device which are including in the uninterruptible power signals and supplies have ratings of both the maximum volt ampere and maximum watt of the 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 that present the reactive loads with the less power factor and apparent value of the electricity, limit may not safely be exceeded into the value.
For example, the large space of UPS system rating to the deliver of 300000 volt ampere at 230 volts can be delivered into the current of 1717 amperes.
The Volt-ampere rating are often used for the transformers, the maximum output of the current is convert into the VA rating is divided by the nominal actual output voltage. When the transformers with the same sized are core usually have the same VA rating.
When convention of the volt ampere is to distinguish the apparent power with the real power has to allowed by 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 budeanu from romanian and introduced at 1930’s by the iec in stockholm, which has adopted to the unit for the reactive power in the circuit.
When the special instruments so called as 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 through the unit VAR is representative of a form of actual power. The SI is to allowed 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 are 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 ciruits.
The 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 which produced by a force of one volt that acting through the resistance of one ohm in 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 sulphur, 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 we take the system of a water pipes is often used as an methodology to help public understand and how these units of the electricity work together. In this methodology, and and the voltage is equivalent to the water pressure, and a 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 as known as Ohm’s law.
Ohm’s Law V = I x R
The Ohm’s law, it states that V is equal to the I flowing in a circuit times the R of the circuit.
One way of the understanding Ohm’s law has to apply it to the imagination plumber system we have employed as a representor of an electrical system.
Let we 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 be come out of these hose. so, if we increase the voltage in an electrical circuit system, we will also increase the current in the electrical system.
Let we make the diameter of the hose small, resistance will decrease, cause a less water to come out of these hose. so, if we high the R in an electrical system, we reduce the current.
Now, we discuss the KW?
kW stands for kilowatt. A kilowatt is called 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 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 which is defined as energy consumption of the thousand joules for one second:
1killowatt = 1000 joules / 1seconds
One kilowatt is equal to 1000000 milli watts
1killo-Watt = 100000milli-Watt
When you get your electricity bills, what do you look at in that bill, obviously most of ours just we look at the total cost to make sure we have not built up a large amount balance. Just you may be 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 is kilowatt and killo watt hour is, which can help you remember!
• How can your energy supplier works out your bills?
• Why some of the appliances use much more electricity than others and the how much individual appliances are in use
• Why you should we turn all appliances off at the wall to save energy costs, and not to be just leave them on standby position. You can then use that information to help you monitor your gas and electricity use, cut costs and lower your bills.
Which is also a good path to make really get a accurate comparisons 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 of you can look at the exact cost of electricity per kWh – and then do the same for gas and electricity.
What are 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. Which is simply a unit of measuring that equals the amount of energy we would use if you keep at 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. Orelse 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 a 11,000-watt electric shower for seven minutes
• Keep an immersed heater 4,000 watts on for 22 minutes
• When we have a 3,000-watt oven for more than half an hour
• When you ironing 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 discuss how will we convert apparent power in volt-ampere VA to the real power in the killowatts in the circuit.
Volt-amps to the kW calculation of these formula
The calculation are as below
P = S × power factor / 1000
then kilowatts are equal to the volt-amps times the power factor divided by the 1000.
kw = volt-amps × power factor / 1000
Let me tell the real power in kilowatts when the apparent power is 2000 VA and the power factor is 0.81?
P = 2000VA × 0.81 / 1000 = 1.62kW