How to calculate the rated power of an energy meter, how to calculate the power of a meter?

For example, the power calculation of Huntkey Calm King.

Rated power 300W

Maximum power 320W

The output current is 27A

5V output current 26A

12V1 output current 18A

The power of this circuit is 12V x 18A=216W

Reasoning like this 5v x 26a=130w x 27a=

216w+130w+

That's a lot more than it's rated. Even if it is impossible to reach the maximum value of each voltage, it is still far from it.

And how to calculate the maximum power between the peak. Question added:

There's always a way to calculate, so don't muddy the waters.

Supplement: Why is this counted, isn't the main power supply of the power supply +12? What's the use of +5V power, you can't insert a graphics card and the CPU, just these two brothers consume a lot of power.

I'll help him answer The input content has reached the length limit, and you can also enter 9999 words to insert**delete**Insert mapDelete mapInsert****Map can get 2 experience points, and if you are selected as satisfied, you can increase experience and wealth points simultaneously.

24A + 5 = 29 for 5V multiplied by 10 = 290W

This one is rated at 290W, is the version, only one way +12V

version and version of the power is one more way +12v2, it is calculated as;

12v1 + 12v2 + 10) multiplied by 10 = rated power.

For example, Huntkey Wide King 2 generation 12v1=then it should be.

The method of judging the power of the ATX version is to multiply the maximum output current value of --- 5V by 10 to get the approximate value of the rated power, for example, if the maximum output current value of +5V is 25, it will be 250W. A maximum output current of +5V is 300W.

The power of the ATX12V version is determined by --- the 5V maximum output current value plus 4 times 10. For example, if the maximum output current of +5V is 21A, the power is (21 4) 10 250W. Similarly, (26 4) 10 300W, (18 4) 10 220W.

With this formula, you can get a rough estimate of the power rating of the power supply.

The way to judge the power of the ATX12V version is --(the sum of 12v1 and +12v2 plus 10)x10, which is roughly equal to the rated power.

The rated current is multiplied by the rated voltage.

Method 1: Directly call up the current power data (applicable to smart meters installed in the power department).

Press the button on the meter to switch the content displayed on the screen until the unit on the right side of the meter screen is only the word "kw", at which point the number on the screen is the electricity power, and the unit is kilowatts.

Scheme 2: Calculate the flashing period by pulse indicator (applicable to all electronic energy meters).

First, find the pulse constant of the meter (generally printed on the front of the meter, the unit is a data of imp kwh), and then use the stopwatch to measure the interval (in seconds) between two consecutive flashes of the meter pulse indicator (a red light that flashes from time to time), and use the following formula to calculate the average power (in watts) between the two flashes:

p=3600000 pulse constant The time interval between two flashes.

The power consumption of a device with a power of 1000 watts is 1 kilowatt-hour of electricity, and if the power of a power-consuming device is 2500 watts, that is, its power consumption in one hour is kilowatt-hours, that is, one kilowatt-hour of electricity.

The power of the speaker is 20W, that is, its power consumption for one hour is kilowatt hours, and the electricity consumption is one hour.

Degree is the abbreviation of the unit of measurement of electrical energy in daily life, 1 degree = kilowatt hour), kilowatt hour is the unit of electric work, symbol: kw·h, and the calculation formula is power multiplied by time.

According to the law of conservation of energy, 1 kWh of electricity is 1kWh, which is 3600000WS, because 1WS = 1 joule, so the result is 3600000 joules.

There are three formulas for calculating electrical power: p=ui, p=i2r, p=u2 r. Where: p is the electrical power (W), U is the voltage (V), I is the current (A), and R is the resistance ( ).

As a physical quantity that indicates how fast or slow the work of an electric current is done, the magnitude of the power of an electrical appliance is numerically equal to the amount of electrical energy it consumes in 1 second. If in"t"(SI unit is S) the electrical energy consumed in such a long period of time "W" (SI single big selling tan is allocated J), then the electrical power of this electrical appliance is P=W T (defined) electrical power is equal to the product of the voltage at both ends of the conductor and the current through the conductor.

p=u·i）。For purely resistive circuits, the electrical power can also be calculated using the formulas p=i 2*r and p=u 2 r.

Rated power

The output power of the power plant or the input power of the device that consumes energy under normal operating conditions. It is often measured in "kilowatts". It also refers to the power that a factory produces a machine that can achieve when it is working normally.

That is, the power of a machine is usually said, the rated power of the machine is certain, p=fv, so the force generated by the machine is inversely proportional to the running speed.

For example, when a car is driving on a flat asphalt road, it needs less traction f and can go at a higher speed; When the road is uneven or going up a hill, you need a lot of traction, so you have to switch to low speeds.

The power is expressed in kw, and the amount of electricity is multiplied by the time of use (time unit hours), and if there is no inverter, the power is directly multiplied by the number of hours used. For example, if the power is 20kw and you use 10 hours a day, then the electricity consumption in a day is 20 times 10 = 200kwh, which is 200 kWh.

100W is one hour of kilowatt electricity, kilowatt hours.

1000w = 1 kilowatt, 1 kilowatt is one kilowatt per hour.

The meter shows 105119 kilowatt-hours (kw·h) instead of kilowatts (kw) kilowatt-hours (kw·h) is the unit of work, and kilowatt (kw) is the unit of power. The two are not the same concept.

To know how much power the meter can carry, it depends on the current and voltage values on the nameplate of the meter.

For example, 5(60)A 220V in the figure below means that the allowable current of the meter is 60A and the voltage is 220V.

Voltage, current, power. The allowable power of the meter in the figure is: 60 220 13200W.

You can only bring one 9 kilowatt appliance.

The meter shows the degree of electricity you use, 1 kilowatt is 1 kilowatt multiplied by 1 kilowatt is equal to 1 kilowatt of electricity, whether this can be driven depends on your wire, the wire will generally be marked with rated power, the higher the power, the thicker the line, and the meter has nothing to do with it, the meter is just a billing tool.

The formula for calculating the power required for an electric motor is:

Power (p) = voltage (v) x current (i) x efficiency ( ).

Among them, the voltage can be obtained from the machine, the current can be calculated from the current of the machine, and the efficiency can be obtained from the machine's specifications.

If you are using a smart meter, it is recommended that you can check the current meter readings through the LCD screen on the meter; A string of numbers on the screen will directly display the integer and decimal of the meter reading, the model of the meter is different, and the data displayed on the LCD screen may be different; You can press the wheel display button next to the screen to change the display interface to view the data displayed on the LCD screen with the words "current total power" or "current positive active total", that is, the cumulative power consumption of the current meter.

If you are using a mechanical meter, you can see the cumulative electricity consumption recorded by the meter through the numbers contained in the bridge in a row of windows on the dial of the meter. In general, the red window represents the decimal part, which is 1 decimal place; The black window represents the integer part, starting from the far right, eliminating the first digit as the single digit, and so on.

If you need to calculate the actual electricity consumption during a certain electricity consumption period, the electricity consumption = this meter reading - the last meter reading reading, if your meter is equipped with a transformer, you also need to multiply the multiplier of the transformer.

We hope you find ours helpful.

Experimental principle: p=w t

Experimental equipment: electric energy meter.

Stopwatch. Protocol Procedure:

1) Except for the electrical unit under test, other electrical appliances must be turned off.

2) Look at the nameplate of the energy meter.

and make a record. If it is 3000r kW h;

3) Turn on the electrical appliance, start to press the stopwatch to time t seconds, and count the number of revolutions of the electric energy meter at the same time;

4) According to the recorded data, calculate the electrical power of the electrical appliance to be measured.

1=n：ww=n/3000

p=w/t=n/3000t

Problems that should be paid attention to in the experiment:

1) When measuring the power of household appliances with an energy meter, other electrical appliances except the electrical appliances under test must be turned off. If the power of the appliance is not very large, the change in the number of energy representations will be small when measuring, and it will take a long time to read the changed value. Therefore, it is best to see the number of revolutions of the turntable of the electric energy meter, calculate the electric energy consumed by the electrical appliance by the number of revolutions in a certain period of time when the electrical appliance is working, and then use the electric energy and time to calculate.

2) If it is measured when other electrical appliances must work, their electric power can be found out through the instructions of these electrical appliances, and the electric energy consumed by these electrical appliances during the measurement time can be calculated, and the difference is the electric energy consumed by the electrical appliances under test during the measurement time.

3) After measuring the power of the electrical appliance to be measured, the rated power indicated with the electrical appliance.

Compare, if there is an error, analyze the cause.

Generally, the dial of a household energy meter is marked with the number of revolutions per kilowatt hour. For example, an energy meter is marked with 3

000r kw·h, which means that for every 1kw·h of electrical energy consumed, the turntable of the energy meter (there is a red mark on the edge of the disk) turns 3

000 rpm. This value on the disk can be used to determine the electrical power of the electrical appliance.

Now only let the electrical appliances of the power to be measured work, and write down the time it takes for the wattle of the energy meter to turn a certain number of revolutions (time is OK).

Use a stopwatch or the second hand of a watch to measure). For example, if the turntable turns 15 revolutions, that is, 3000 revolutions, the electrical energy consumed by electrical appliances is.

kw·h＝。If the measured time of 15 revolutions is 180s, then the electrical power of this appliance is.

100w。Actually measure the power of the bulb to see if the measured power matches the rated power indicated on the bulb.