Power of electrical installations. Volt-amps (VA) and Watts (W). What is the difference?
Many people have noticed more than once that the power of some electrical installations is indicated in watts, and the power of other electrical installations is indicated in volt-amperes. In this article we will explain the difference between these two units of measurement.
Watts and volt-amps - the eternal confusion
Introduction
Prerequisites
The power consumed by computing equipment is expressed in watts or volt-amperes (VA). Power, expressed in watts, represents the active power consumed by the equipment. Volt-amps are called “apparent power” and are the result of multiplying the voltage supplied to the equipment by the current drawn by the equipment.
Both characteristics are used - both watts and volt-amperes, but for different purposes. The watt rating defines the active power purchased from the utility and the thermal load generated by the equipment. The volt-amp rating is used to calculate wiring and circuit breakers.
Characteristics of computer power in watts can be exc.
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What is the difference between volts and watts? Computers, gadgets, Internet To calculate the load on the electrical network and energy costs, you can use a special calculator for converting current to power. Ask, I'm in touch!
What are the amps and watts associated with it?
Volts = Current (amps) x Resistance (ohms) Watts = Volts x Current x PowerFactor
What is the definition of amperes and watts?
Definition of ampere: "This constant current, if maintained in two straight parallel conductors of infinite length and negligible cross-sectional area and placed one meter part in a vacuum, will produce between them a force equal to 2 pix 10^-7 newtons per unit length."
How do Watts relate to Ohms?
ohms is a measure of resistance (R) in a circuit. Watts is a measure of power (P), in this case suggesting that it is the power used by a resistive element (lamp, heater, etc.). Power (W) = Current (Amps) x Current (Amps) x Resistance (Ohms) or Resistance (Ohms) = Power (W) / (Current x Current)
How do you convert volt-amps to watts?
How to calculate amperes if there are no watts?
Answer.V = R * I and W = V * I. so. W = R * I * I. Example: 10V = 2R * 5A. 10V * 5A = 50 W. 2R * 5A * 5A = 50 W
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Built-in Chandelier
Difference between watt and volt-amperes?
If you have 500 watts and 240V, what are the amps?
The equation to use is I = W/E. Ampere = Watt/Volt. Amps = 500/240 = 2.08 amps.
What is meant by volts and ohms?
Current and resistance. Dependence of current on resistance
These are two more physical electrical quantities. Current is measured in amperes. Letter abbreviation: A (spelled the same in Russian and English). In formulas, current is denoted by the letter I (also most often a capital letter). Resistance is measured in ohms. Letter abbreviations: Ohm (Russian designation), Ohm (English designation) and Ω (universal international designation). This is where a little difficulty begins. The current strength directly depends on the voltage and resistance. I won't go into detail here. To do this, I recommend reading the article about Ohm’s law. If you don't know him yet, it's advisable to do so before you start reading further.
What is "volt-ampere"
Important! Sometimes VA is mistakenly equated to total power or treated as a unit absolutely equivalent to a watt. This is an error associated with the identification of a certain quantity and its dimension.
Having figured out what VA is, you need to consider what needs to be done if you need to convert volt amperes to watts. To solve everyday problems, you can follow the following algorithm:
- In the power supply instructions you need to find the value of the power it consumes. Often manufacturing companies indicate the value of this parameter in volt-amperes. It indicates the largest amount of electrical energy that the device is capable of consuming from the network. Thus, it can be equated to the full power value.
- Now you need to find out the efficiency of the source being used. It is determined by the features of its design and how many devices are connected to it. In practice, this coefficient when connecting household and professional appliances usually varies between 0.6-0.8.
- After this, the actual conversion of volt-ampere units to watt units is performed. To perform this, you need to find out the active power of the device that supplies uninterruptible power. To find out its value in watts, you need to multiply the consumed power parameter in volt-amperes, indicated by the manufacturer in the accompanying documentation, by the efficiency of the device (also known as power factor). This can be expressed using the formula: B = VA*efficiency.
A calculator is also used to convert va to tu. You need to fill in the fields that the screen form offers with values corresponding to the indicators of a particular device, and click the button that initiates calculations. Upon completion, the user will receive the desired power value in watts.
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How to convert volt-amperes to watts - power calculator Remember that for high-voltage networks, the indicated current differs depending on the efficiency. Ask, I'm in touch!
What is the difference between W and V (V and A)
What is the difference between a volt and an ampere: Volt is a unit of measurement of voltage, and watt is a unit of power. V is the difference created in the electrical potential across a wire line when a current of 1A dissipates a unit of power, i.e. voltage. The definition of voltage is that it is the potential of electricity between different points. Along with this, it is used to indicate the difference in potential energy of an electric charge between points. An energy source is a voltage that represents expended or lost energy.
About power
Attention! Voltage is hypothetically similar to the pressure created in a circuit, pushing electrons through.
The passage of current must be ensured on two paths. This characteristic is considered the total energy for moving the charge. The definition of voltage is based on the fact that negative charges are attracted to high values, and positive charges to low values.
W – speed of work. The speed is maintained at 1 meter per second against a constant reaction force of 1 newton. If we consider it in relation to electromagnetism, the unit is the rate of work done when 1 ampere passes through a potential difference of 1V. Watt is a measure of power.
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Power
Power is the energy flow with which energy is consumed. It happens that in the description of a device it appears instead of kW - kVA. To determine this value, you need to know what is measured in kVA.
No energy is expended to complete the work, but on the contrary:
- One of the factions becomes active, that is, it performs work or transforms into another form.
- The other faction is reactive. The energy is directed into an electromagnetic field.
Attention! These quantities are different, despite the same proportionality. To avoid confusion, the indicator is measured not in watts, but in volt-amperes.
Mechanical power
What is "watt"
Efficiency is also called power factor or cos fi. It is a dimensionless quantity that changes the current in accordance with the reactive component in the load. The coefficient illustrates the amount of alternating current passing through a phase shift relative to the applied voltage. The name cos fi denotes the cosine of a given phase shift.
An example is a hammer drill, the instructions for which indicate a consumption figure of 5 kW and a coefficient of 0.85. Then the full indicator required for its operation (in volt-amperes) will be equal to the quotient of these values: 5/0.85 = 5.89 kVA.
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How many Watts are in 1 Ampere and how to convert them: using a formula or using a program As mentioned earlier in the definition of an ampere, it is equal to the ratio of the amount of charge passing through a conductor over a certain time to the transit time itself. Ask, I'm in touch!
How are they designated?
W is a watt or a volt, some find it difficult to answer. The designation W was noted already in the century before last in Great Britain. The name of the measure was given in honor of the famous scientist, ideologist of the industrial revolution, James Watt, who was also the creator of the first steam engine.
He spent many years studying this indicator and used horsepower to measure it.
Volt is a unit named after the great physicist Alessandro Volta. A volt is defined as the difference in voltage or potential at the ends of a conductor, as well as between conductive sections of a circuit.
Designation of quantities:
- W – watt
- V – volt.
It is an accepted abbreviation (abbreviation) in the international system.
Why do you need a calculator?
The online calculator is used to convert two physical quantities into each other. Converting amperes to watts using such a calculator is a matter of minutes. The service will allow you to quickly calculate the required characteristics of the device and determine the electricity that the equipment will consume per hour of operation.
To convert current into power, it is enough to enter the nominal voltage and indicate the second known value. The calculator will automatically calculate the unknown indicator and display the result.
You can find out the voltage and standard current in the technical documentation of the device. For household appliances, the power is usually indicated, from which the current is also easy to calculate. For convenience, in the calculator you can switch watts to kilowatts, and amperes to milliamps.
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Situation: There is a circuit breaker. Technical parameters: rated current 25 A, 1-pole. You need to calculate what wattage of devices the machine can withstand.
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How many watts is 1500 VA? If we are talking about consumers that have not only active, but also reactance, then, as a rule, they are indicated by P in W active power and the value of cosine phi. Ask, I'm in touch!
Calculating amperage, knowing power and voltage
You can find out the amount of electric current through power and voltage by dividing the second by the first. To make it easier to count, you can use milliamps and kilowatts. There is also a formula in which you need to divide the voltage by the resistance or the power by the resistance, and then calculate the square root of the resulting sum. It is worth pointing out that today you can use a special online calculator, where you only need to substitute known scalar measuring quantities.
Ampere calculation formula for power and voltage
