I invite you to know a bit about engineering concepts, starting from the basics so you can understand how things work around you, once you get familiar with the concepts you will realize that it is easier than it seems engineering, you'll even want to repair things around you (well I hope so XD).
LOAD
We must understand that it can be positive or negative, proton or electron respectively, normally the positive charge is used for the operation of the devices that control the load, for example the batteries that you have in your remote control, when you are moving the charged by a driver, it is represented as current.
The unit of the charge is the Coulomb C, the coulomb is measured every second that passes 1 ampere by a driver.
CURRENT
As mentioned in the previous paragraph, the current is the charge in motion, when doing this movement is practically referring energy from one point to another. It serves the same for communication for example the wifi that you have in your house. The charge will be positive or negative depending on what movement if the protons or electrons are.
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