Verified answer

The internal impedance of an ideal voltage source is zero.

That of an ideal current source is infinite.

A current from voltage source will vary if the impedance across it changes by I=E/Z. The voltage doesn't vary if the load changes

A current source will put out a constant current regardless of load put across it. I = constant

Current sources exist - in power plants a current transformer is an example.

For a real current source, I = constant. So if resistance or impedance is too high, the voltage ( I*Z) across the source will be too high for the insulation on cables and the circuit will flash over. Open circuit = infinite V

Voltage is the answer. Practice working small circuit diagrams using ohms law combinations and that will help you. I was always taught KVA source gives you the same KVA returning. Good luck

voltage is a force which opposes electrons i.e,current to move forward but the current source cannot do so