I want to hijack this comment to plug AlphaPhoenix (https://youtube.com/@alphaphoenixchannel), who is responsible for by far the best explanations of electricity that I've encountered in any format. For instance, this one that clarifies what happens when you try to send electricity on an open circuit, and (IIRC this is the right one) what impedance mismatch is actually about: https://youtu.be/2AXv49dDQJw