balsaman,
This does not seem right. Both the motor and resistor will see 12Volts. The resistor dumps current not voltage.
My guess would be to view the motor and resistor as one resistor as they are wired in series. Thus
12v/10.8 Ohm= 1.11A = 12v*1.11A= 13.32WATTS
But as I'm unsure, I've asked others for help.
3 posts, 3 different figures. Anyone care to garantee that theirs are correct?
Oooouuuhhh. What if you then divide 13.32W by 10.8 Ohms giving 1.23 ohms per watt. (opw ???). multiply 1.23 opw by 4 ohms (motor), giving 4.93 WATTS consumed by the motor, leaving 8.39 Watts of the total 13.32 Watts, to be consumed by the resistor.
That's only 0.02 Watts away from abasir's calculation.
Anyway, thanks for the comments. Perhaps I'll never know the real answer and use over rated resistors, like 25Watts just to be safe.
Thanks again. Regards... |