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Công suất điện là gì? Đơn vị và công thức tính công suất điện

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Today, science and technology have developed rapidly. Almost all human activities and activities need the support of electrical machines and equipment. Electrical appliances that are familiar to people every day such as air conditioners, refrigerators, televisions, etc. all have parameters of capacity, electricity consumption, electrical specifications, etc. These parameters are pasted on devices, aiming to help users actively calculate the amount of electricity consumed in their family. Let’s learn more about What is electric capacity? Please go through this article by thapgiainhietliangchi.

Find out what is electric capacity?

Before going into learning about electric capacity, the formula for calculating electrical power, let’s learn together about some related concepts such as electricity, work of electric current.

What is electricity?

Electricity is the source of energy provided by the passage of an electric current. Or can also be understood simply as electric current capable of doing work. And they can create a heat source that changes the thermal energy of objects. That’s why electric current carries energy.

What is electricity?
What is electricity?

Work of electric current

The work of an electric current is the definition for a measure of the amount of electricity, that the circuit has consumed to convert into other forms of energy.

What is electric capacity?

The electrical capacity of a circuit is the power that the circuit has consumed in a certain unit of time.

Electrical power has a value equal to the power that the circuit has consumed in a certain unit of time. Or it can be calculated by the product of the potential difference between the two ends of the circuit with the current flowing through that circuit.

What is the unit electric capacity? Electrical power is denoted by P, the unit of measurement for electrical power is W.

We have the formula for calculating DC power: P = A/t = U x I

In it, we have:

  • I is the magnitude of the current (unit A)
  • U is the current voltage (unit V)
  • t is time (in s)
What is electric capacity?  Formula for calculating electrical power
What is electric capacity? Formula for calculating electrical power

Some problems related to electric capacity

Meaning of electrical capacity on equipment

On home appliances that use electricity, the manufacturer will always provide indicators of capacity or power consumption.

For example, the above air conditioner will have a capacity of 850W. That is, within 1 hour, the air conditioner will consume 850W of electricity.

Besides, in fact, the number of W recorded on an electrical device will also represent the rated power of that device. We can understand that is the electrical capacity of the device when it is operating normally.

Note:

  • If on electrical tools and equipment, 220V – 300W is written. That means that electrical equipment must be used at the rated voltage of 220V. When the power consumption is 300W, the device will work normally.
  • Besides, from the formula to calculate the amount of electricity consumed by electrical equipment, it is the formula for calculating electrical capacity. Determining the amount of electricity consumed in 1 month is completely easy to calculate.
  • Power consumption will be calculated in units of kW/h or W/h. With 1kWh equal to 1000Wh is an amount of electricity

The formula for calculating electrical capacity above can be applied to almost any common electrical appliance in the home, can be applied to calculate how much electricity the electrical appliances have consumed in a month. much.

From the summation of all electricity consumption in the household. We add those values ​​together to get the total power consumption of electrical appliances in the household. From there, make a plan to use electricity most effectively.

Formula for calculating electrical power
The formula for calculating electrical capacity helps us to have an efficient electricity use plan

Formula for calculating 3 phase current capacity

Almost all electrical appliances used in home life today use 3-phase power to operate. Therefore, many people are quite interested in calculating the power consumption of 3-phase devices. To decide whether to buy the device or not.

We have the formulas to calculate the electrical capacity of 3-phase current:

  • P = (U1*I1 + U2*I2 + U3*I3) *THE

In there :

– H is the time interval in hours,

– U is the voltage,

– I is the current,

In there:

– I is the effective current flowing through each load

– Cosφ is the power factor per load

Distinguishing units of measurement of electrical power

– k stands for kilo

– V stands for the word Volt

– A stands for Ampere

In an AC network, the apparent power S will be the vector sum of the real power P and the reactive power Q.

Volt-Ampere, often abbreviated as VA, is a unit of measurement for the power of an electric current. This unit is calculated as the product of the voltage in Volt with the current in Ampere.

In a DC circuit, VA will be equivalent to Watt (W). However, in AC current, VA will often be used to calculate the apparent power and Watt is used to calculate the real power.

On an AC circuit, the apparent power will usually be larger than the actual power.

– K stands for kilo

– W stands for Watt which is the unit of measurement of power P in the international system of measurement. This unit is named after scientist James Watt.

Power will indicate the change in energy ΔE over a given period of time Δt.

  • What is a short circuit?

Circuit segment AB is connected to a power source and at this time the power source will create a potential difference U between two points A and B. This will generate a displacement current on circuit segment AB.

What is a short circuit?
Short circuit phenomenon

Current flows through the resistor R and heats it up. Thus, the circuit has consumed power, then converted into heat energy.

We replace the resistor R with a filament bulb, the bulb will light up when it has current flowing through. Thus, the electrical energy of the above circuit has been converted into light energy.

When in the circuit, no resistors or power consuming devices are installed. If the negative and positive poles of the power supply are connected directly (also called a short circuit), a short circuit or short circuit will occur in the circuit.

This short circuit has the potential to generate a great deal of heat and can cause a fire or explosion in the conductor, which is very dangerous.

Thus, thapgiainhietliangchi.com has provided you with all necessary information related to electric capacity as well as other issues. Hopefully, the above article can help readers calculate the amount of electricity you consume every day, so that you can plan to use electricity most effectively.

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