Calculate voltage drop depending on cable length?

Question

Electronics

There is a Samsung Galaxy Tab 3 tablet. It serves as a monitor for a smart home and displays the status of various devices, weather, cameras, etc. It has a Motion detector installed, which activates the screen if someone appears in front of the camera. And this thing eats an unreasonable amount of accumulators. This is an introduction.
The tablet is built into the wall and a multi-core cable is connected to it. This cable charges the battery. The cable is long enough, I don't know its exact length, but it's definitely at least 10 meters. It is laid in the wall and how exactly I do not know. Since the distance from the network to the tablet is decent, the voltage drops along the way. I have not measured, but I think at least 1 volt out of 5 is lost. Accordingly, the tablet charges very slowly. And recently, if the battery is already dying, or for some other reason, but the battery does not have time to charge. As a result, it sits at 0. You have to take out the tablet, charge it separately and then return it to its place.
Actually the question is this. How to provide the tablet with the necessary level of power?

Answer 1

Estimate the drop, knowing the diameter of the wire, the approximate length and the current consumed:
electricalschool.info/main/sovety/1084-raschet-sop...
Or measure the voltage on the power supply and on the tablet - and using the above formulas, you can estimate the length of the wire.
> Actually the question is this. How to provide the tablet with the necessary level of power?
Feed more voltage at the input, lowering it to 5 volts directly at the input to the tablet - so the losses will be less.
The only voltage at the input should be chosen from the type and quality of your cable for electrical and fire safety reasons.

Answer 2

I brought 220 volts to the projector (powered by 12 constants), and I already installed an outlet in place and included an adapter there.