Calculate Power Consumption (W) for Processor, Hob, Disk & Home Appliances: Voltage & Amps

Question

Hello

How to calculate how many watts are consumed, for example, by a processor, hob, disk and other components and also other home appliances without looking at the technical data in the manual.
Eg 1.8V processor? You also need amps to calculate it or not? Is there any way.

Thanks in advance

adams987 · Answer

In such a simple way, it is possible to calculate the power consumption of a light bulb or a heater, because the consumption practically does not change with time and equals voltage X intensity. You probably know well that the processor or disk does not always work with 100% load. The power of such elements is given by the manufacturer.
For alternating current, we also have cos?, it is the power factor and depends on the nature of the load, then power = U * I * cos?, and such a load with variable cos? is e.g. an electric motor,

dezkom · Answer

And assuming that it will work with full load, then the formula: W = V * A

kortyleski · Answer

P = U * I
I = U / R
Where:
I - current in amperes
U - voltage in volts
P- power in watts
These formulas are valid for direct current and for alternating current with resistive load.
The computer processor draws current depending on the load of programs, you should measure the average value of the current - rather unfeasible in amateur conditions.
It is easier to estimate the current consumption of the entire computer by measuring the current consumed on the mains (carefully - risk of electric shock) and using the formula:
P = U * I * cos (phi), unfortunately I do not know what is the phase shift angle in the computer power supply ...

dezkom · Answer

And this cos (phi) is a constant value. If so, how much is it. Where should I get it.

adams987 · Answer

It is provided by the manufacturer, but it is not always constant, it depends on which device. For example, in a transformer it changes depending on what is connected to it as a load, whether it is resistance or capacitive or inductive reactance.

Added after 2 [minutes]:

Or, for the motor, the manufacturer specifies cos ? = 0.75 but this is at rated power, as if the idle run without load is cos?

Lzep · Answer

Approximately the so-called power calculators, for example: best regards

forestx · Answer

In the case of switching power supplies, a parameter is used called the power factor (it is not equal to cos?

.
This is because the current waveform is non-sinusoidal.
Measurement of the current consumed by the computer will not help us do anything (even made with an ammeter with TrueRMS), because we do not know the power factor.
I use an electricity meter to measure the power of computers.
Give the full list of components: processor, graphics card, drives, disks - I will approximate the power consumed for you.

Added after 4 [minutes]:

Calculators on the manufacturers' websites calculate the minimum power of the power supply (and they usually overestimate this power). It has little to do with the power drawn from the grid. For example, my set consumes about 100W (140W "under stress") and according to the calculator above, it comes out over 200W.

dezkom · Answer

Is such a device target=_blank rel=nofollow noopener ugc class=postlink inline title= > will have accurate measurements and is it worth buying something like this? Will it accurately enumerate the consumed power? Write more carefully! No errors, using Alt etc. - regulations p. 15. Before posting, use the Spelling button [Mirek Z.]

waldekg · Answer

Hello. The energy meter will measure everything accurately, but you need to read the manual to correctly interpret its indications. To calculate the costs of electricity consumed, the meter must be programmed. When buying, you need to check that the instruction manual is in Polish. Best regards.

sony1 · Answer

There are certainly several measures, which one should you choose? The moderator has already learned. It is okay. Spaces! This time I corrected. [Mirek Z.]

Calculate Power Consumption (W) for Processor, Hob, Disk & Home Appliances: Voltage & Amps

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