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I recently received two so-called power server devices which I ordered a couple of weeks ago from Aliexpress according to the manual the product promises to actively monitor and improve the power factor optimizers the wood age and current amounts and thus reduce my electricity bill up to 35% all of that is possible by simply plugging the gadget into the wall sockets and since pretty much every feedback on their site is positive it has to be true right well in this video let's open up those devices learn a bit about reactive power and finally discover the truth of this high efficient technique of Germany let's get started first off I cracked open the plastic power saver by unscrewing one hidden screw and applying a bit of force inside I found a PCB you will refuse for badly soldered and resistors to green LEDs and literally a black box which is connected in parallel to the mains inputs after removing the box from the main PCB year I use D transistor tester to find out that the box is actually a high voltage capacitor with a capacity of roughly 2 micro farad's and the LEDs are only used to discharge the capacitor want the connection to mains voltage is interrupted so there's definitely no active monitoring happening here maybe the second metal power saver which is certainly missing a protective conductor since its casing is metal and thus conductive is the real deal inside we can once again find a fuse led a mostly empty PCB and believe it or not two black boxes which are labeled this time s 5 micro farad capacitor so in a nutshell these so-called power savers basically connect a capacitor in parallel to your other appliances but why well in order to present a more practical explanation let me firstly wire up my a transformer in order to create a small AC voltage which is safe to work with for the first test circuit I simply connected a six volt light bulb to the output of my transformer increased voltage to obviously six volts RMS and observed that the current which flows through the pole follows the same path st sinus all your voltage this behavior is known as a resistive load the next type of load is inductive which can be a coil or more popular motors which basically consists of coils this time the current is lagging and follows the voltage will be phase shift of 90 degrees and last but not least we have the capacitive loads which is the opposite of the inductive loads because this time the current is leading we were phase shift of 90 degrees as well but in the other direction so what does that mean for our power consumption if I connect a common energy meter from Germany in serious to the resistive loads which consumes around 20 1.6 watts at 6 volts and 3.6 m/s we can see that the counting wheel does spin because we are drawing real power which for example creates lights and heats but if I power my inductive loads with 24 volts which draws 0.91 amps it should consume around 20 1.8 watts as well but the counting wheel spins way slower the reason is that the inductor creates reactive power by building up and then reducing its magnetic fields which lets energy oscillate between the energy producer and load which strains the power grids this is measured in volt ampere reactive not watts and is as we already observed not measurable we've become an energy meter and since the capacitor builds up and releases its electrostatic fields with AC voltage it also creates reactive power but opposing to the inductive reactive power which means that the capacitor in parallel to an inductive system can reduce the phase shifts and thus decrease the overall reactive power but because the common household energy meter cannot record reactive power there is no need to resuts to save money especially not with an uncontrolled not monitoring system like those power save us and to give you a more practical example let's have a look at what the current consumption of my living room looks like as you can see it looks nothing like what I just clarified the reason are the nowadays widely used switch mode power supplies which do not raw sinusoidal current this creates current harmonics which does deform the sinusoidal mains voltage and create an upper kind of reactive power so called distortion reactive power and the power saver aka capacitor can actually decrease those current harmonics but on the other hand simultaneously increased the overall reactive power by 130 watts impair reactive or an old saving money with the power saver is most likely not possible so let's change Germany to China and forget about this nonsense as always don't forget to Like share and subscribe that would be awesome stay creative and we'll see you next time