I read with interest all the theories and counter theories relating to Ohms law. At the end of the day can this information be utilized to provide guidance in making a selection of motor and battery combination. Many specifications given for electric motors ( Chinese origin ) only indicate the max current the motor can withstand. No other information is provided other than dimensional sizes. If power equates from voltage multiplied by current then can it be assumed that if i select a motor with say a maximum rated current of 10 Amps i can expect 100 watts of power if say 10 volts is applied and 150 watts if say 15 volts is applied. If this is true and efficiency needs to be included in the formula then selecting a motor based on max current may be an easier way to calculate a motor /battery combination. Then comes the question on prop size versus current draw. Regards Rob Carey