What determines the voltage at both ends of an ideal current source for circuit analysis What determines the voltage at both ends of an ideal current source The voltage at both ends of the ideal voltage source is determined by ()

What determines the voltage at both ends of an ideal current source for circuit analysis What determines the voltage at both ends of an ideal current source The voltage at both ends of the ideal voltage source is determined by ()

Load, according to Kirchhoff voltage law, UI = I * r, ideal current source, constant current, so the voltage is determined by load
The voltage of an ideal voltage source is determined by itself, and its voltage is constant

The circuit is shown in the figure, try to find I, I1 and us, and judge whether the ideal voltage source of 20V and the ideal current source of 5A are power supply or load?

This is a good solution to Kirchhoff equation in Electrotechnics, but it's very troublesome to answer it