Amps

[bwells]

Big assistance. Makes sense but I will have to rethink after the 3 20 oz. Fosters goes away! Thanks much

[egneg]

You are missing 1 essential difference. Your house is AC (alternating current) and RC boats are DC (direct current). Google the properties of both and then move forward from there.

[ls1fst98]

i thought that was also a large difference in the way the amp draw was affected, but i was not sure and not familiar with it. thanks egneg, like i said my knowledge is limited.

[bwells]

ls1fst98: I've been thinking about your posts and think I got it! Let me run this by you, I see in the formula AXV=W that changing the volts will change the amps to keep the same watts, so to go from a 4S to a 5S will decrease the amps. I see changing any variable will effect the whole equation but how do you change the amps? Is this where the turns, windings, and/or poles on a motor comes into play?

[ls1fst98]

well thats going beyond my knowledge of the motors and what not. im not that familiar with it to accurately answer that question. i hope someone can chime in here and give us a better answer.

[bwells]

Thanks for your input, it is greatly appreciated. I assume there is a way to change the amps but not sure what does it. Thanks again.

[robinator63]

In a DC circuit, Ohms law states that:

E=I X R
I=E/R
R=E/I

Where E = Voltage I = Current R = Resistance

Theoretically with a given resistance (motor), if your voltage doubled your current would be cut in half. And vise versa.

Same with AC. This is why power is transmitted in ultra high voltages until it reaches substations, where transformers convert the high voltage - low current power into usable voltages with much higher current. If you transmitted 120/240 volts across miles of power lines with necessary household current they would need to be about 3 feet in diameter!!!

Just thoughts....

[Shooter]

Bwells'

Your house total power: 200 amps (the main circuit rating) TIMES 240 volts (voltage coming into your house) = 48,000 watts of power

Your boat total power: 200 amps TIMES 22 volts (6S) = 4400 watts

Its the voltage!
Your house is running on 240 volts (two circuits of 120 volts), thats over ten times as much voltage as your boat. Your house is the equivelent of 64S !
Your boat is only 22 volts, so needs alot of amps to generate a few horsepower.

Just think, if you had 64S in your boat and your motor drew 100 amps, that would be = 24000 watts = 32 horsepower!!

At 64S there would be a lot of electructed boaters!!

Mark

You hit the nail on the head, Mark.