Measurement of current, the movement of one coulomb of charge in one second. Depending on the application, a few milliamps can be a lot of current whereas in power applications, thousands of amps is the norm.
Ohm’s law - The voltage v across a resistor is directly proportional to the current i flowing through the resistor.
Fundamentals of Electric Circuits, 5th Edition by Charles K. Alexander and Matthew N. O. Sadiku
The basic unit of current. 1A=1C/1s or 1A=1V/1Ω.
Grob’s Basic Electronics, 11th Edition by Mitchel E. Schultz