In an electric circuit with a resistor of resistance R there is energy conversion to other forms. If there is just one resistor then the voltage drop over the resistor is always equal to the battery voltage drop. But does this mean that the change in potential energy of electrons is totaly converted in the resistor or does some conversion also happen at the pole of the battery where electrons sink? I am thinking of perfect conducting wires. So if you have 1 A and 2 ohms you get that the power consumption is 2 W. Does this mean that the power consumed is 2 W in a resistor? And how is that possible? Shouldn't the battery itself take some of this power where the electrons are being absorbed?