Do watts from a generator add up?

Question

So I'm sort of new to this project I'm doing. I made a miniature hydro-electric generator a few days ago, and to test it, I've just spun it as fast as possible by hand. It made 1 Volt, and the wire I used tested for 15 Ohms of resistance. Using Ohm's Law, I calculated about .06667 Amperes, and from that, I got .06667 Watts. So since I'm new to this, I was wondering, does this mean that it's like, .06667 Watts per second, or am I misunderstanding the definition of Watt?

Also, if I haven't misunderstood (which is doubtful), does this mean that after approx. 4.16 hours, I'd have made 1 kiloWatt?

[4.16 gotten by taking 1000 watts/1kW, divide by .06667 watts/1 second (not sure if the "second" part is right), take that, and divide by 3600 seconds/1hour]

so once again, that formula probably isn't right, but any help is appreciated.

Thank you very much.

-Foralis

Answer 1

The power is

P = V x I = volts x amprs = watts

P = 1 x 0.6667 = 0.6667 watts

The energy is:

E = P x Time

The time is in seconds or in hours, but not used 3600 seconds to converts. There are per definition.

E = P x Time = watts x hour =  watts-Hour

E  = 0,6667 x 4,16 = 2.77 watts-Hour

E =  [ 2,77 / 1000 ],   KWh = Kilowatts-Hour

E = 0,0028 KWh

Answer 2

A Watt is 1 J/s. It is a measure of work. A kWh is a measurement used to standardize the number of Watts used. So, if you're pulling .06667 watts for an hour, you would have used .06667 Wh or .00006667 kWh, in two hour you will have used .13334 kWh. If you doubled your wattage, you would use the same number of watts in half the time.

I hope this helps

Answer 3

Same problem from last time you asked this question. Didn't you read it?

you say "wire I used tested for 15 Ohms of resistance" and everybody assumes that is the load resistance.

You have NO load, as I said before, and no current is flowing. You need to put an external load, such as a resistor on, and then measure the voltage, from which you can calculate the current.

"Watts per second" is meaningless, since watts are already "per second", joules per second.

When you measure your actual current and voltage, then the power is that product. That's it. You get that power as long as you spin it.

You can say you have (for example) 0.6 volts are 10ma, then you have 6 mw. If you run it for an hour, you will have made 6*3600/1000 = about 20 joules of energy.

Please, read my last answer, you are getting incorrect answers and getting more confused. Contact me if that will help.

I tried to send you email, but you have it blocked.

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Answer 4

A Watt is a *rate* at which energy is produced (in the case of a generator) --  Energy per time.

A Joule is a unit of energy -- in this case electrical energy.

A Watt, then, is one Joule per second and a Joule is a Watt*second.

So, a kiloWatt-hour is a unit of Energy (not power) and would be 1000 Watts * 1hour

which is

1000 Joules/second * 3600 seconds = 3.6 MegaJoules of energy

For your generator, you spun it as fast as you could by hand and got 1 volt across 15 Ohms and got 0.0666 Watts.  IF you were to spin it faster (somehow) you would be applying energy at a faster *rate*, so the power would go up, but I doubt you could ever get energy coming out at a rate of 4 kW -- that would be a large generator (about 5 HorsePower -- which is another unit of power: 1 HP = 746 Watts).

At whatever rate you spin the generator, and produce energy at a certain rate, so long as you spin the generator, energy will be produced.  The number of Joules will add up and after 3.6 million of them, you would have produced 1 kWhr of energy.  But at a rate of 0.0666 Watts it would take about a year to get 1 kWhr.

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