I've got one of my powabyke motors in bits and was tipped to measure resistance of the brass brush holders, through which all current must pass to reach the brushes They both came in at a whopping 0.7 ohms. Was wondering what the formula was for working out how much energy is lost as heat in these parts. The battery voltage is 36 volts and the motor draws 20 amps peak. Perhaps an average of 8 amps during normal riding. Fortunatley its a nice easy modification to bypass them but I'm curious to know how much energy I would have lost.