High currents and Low currents have a very clear distinction, is the sum of the currents used in a job they do. This term is actually growing in the industry.
boundary weak and strong current flow is quite clear but in some modules, PCB or electronic parts the other two terms can be joined for example, inverter, rectifier, or power supply, even in DC-DC converter.

In the industrial world, people who take care of electrical power such as the National Electricity Company line air conditioners, generators, power networks for the machines. they are divided into groups of strong currents.

while orang2 who are involved in the computer hardware, monitors, communication tools, the module controller, PLC, microcontroller, and the like used to enter the weak current.

In schools this is usually separate disciplines such as strong currents installation electric department, industrial electricity, etc., while the weak current department is electronics, industrial electronic, electronic communication, or even the instrumentation industry classifications into the weak current.

but in reality the industry and keeping this term is absent and only have one term that is part electric.

This explanation is only a general description, and I think quite hard to distinguish the term is based on the value above the current instance 1Ampere called strong flows because orang2 who worked with the inverter device can be achieved when they are grouped 15A weak currents, even at times a strong current of people just install the tool which the current consumption of only 0.2A.

so anything with the voltage magnitude is quite difficult to distinguish for this term.