Reading about solar panels i came across a peculiar description - "When the panel is short circuited, there is current but no voltage, so no power is being generated." How does that work? What does the current represent in that case, and what moves the needle of an ammeter? Another instance of the same problem happens when charging a big capacitor. At first, there is essentially no voltage across it, but several dozens of amperes of current is going into it. Once again power, 0*I, is about zero, and yet the power is being consumed into the capacitor. What am i missing here?