I watched the lecture and at this point there is mention about AC generator and wall outlet, that there is only voltage and, obviously, no current until we plug in some load.
Since that, one thing start to disturb me so I have a question.
If we connect a wires to a DC voltage source terminals and leave them open ended there will be tiny currents during transient state as the wires charging to the terminals potentials. And no currents after that as should expect from open circuit. Then if some load are plug in there will be current in the circuit which depends on the load resistance.
What if there is same circuit but AC source instead of DC. Connected wires keeps constantly recharging since source voltage now permanently changing as well.
Does that means there actually always will be small currents in the wires solely because of these charging processes despite the fact that the circuit is open ended ?
At same time it is considered that there is no currents in a wires of open AC circuit (as example the case of wall outlet in the video above). This confuse me a bit.
Only way I can think of it that the small "charging" currents are neglected.
And when some load is plugged, a currents in the circuit will begin to increase in order to be adjusted to the load impedance. And from that moment it customary to talk about "traditional" current which appears in a circuit, dependance I=V/Z, power consumption etc. Besides that, I assume some portion of that "traditional" current would continue to "used" for the wires charging. Is this correct ?
I'm not read about transmission lines in details yet so probably better to assume that frequencies and wires length in examples above are small enough to avoid phenomena specific for TL.
Sorry for my english and thanks for the help.