How do i measure electrical power over time ?

[e2matrix]

@e2matrix

What a beautiful little piece of kit !

Is that something from the early 20th century ?


Gary.

I just grabbed that pic off eBay as I didn't have any pics handy of my own.  I've got 4 of these mechanical kilowatt hour meters beside the one on my house.  The ones I've got work on both 120 or 240 volt and many of these are still in use in many areas although I know some have gone to the digital meters.  I think from what I know about them that if FE experimenters were to use these to validate any real power input/output measurements there would be no doubt about whether you have a real overunity device.  The ones I have are made by GE and have manufacture date stamps between 1979 and 1985. 

[DeepCut]

Thanks e2 i'll look for one on ebay, it looks good as well as being incredibly handy.


Thanks,

Gary.

[exnihiloest]

Hi.

I've just read this : http://en.wikipedia.org/wiki/Power_%28physics%29

but i don't understand how i would calculate say, if my 1kW heater was on for 3 minutes, how many watts would it have used ?

Apply Wikipedia formula P=dw/dt, or dw=P*dt.

If P is constant during a time interval Î"t, then we can write: w=P*Î"t
w the energy in KWh, P the power in KW, Î"t the time in h.
or
w the energy in Joule, P the power in W, Î"t the time in s.

Here: P = 1kW, Î"t = 3mn = 3/60h = 0,05h
Thus w = P*Î"t = 1Kw * 0.02h = 0.05 KWh (= 50Wh).

If t is expressed in seconds and P in watts, then w is in joule:
Here w = 1000W * (3*60)s = 180 000 J.

A 1 Kw heater during 3 mn has consumed 50Wh or 180 000J.