> On Mon, 30 Aug 1999 23:15:56 -0500 "Billy Brown"
> <email@example.com> writes:
> > Robert J. Bradbury wrote:
> > > However, the calculation assumes that every person on the planet
> > can> > find *some* use for his 10 kg allocation of robots consuming
> > ~100KW> > of power. Right now most of the people on the planet don't
> > > close to consuming 100KW. A standard house (with 200 Amp service,
> > > probably above average), only pulls 20KW when it is maxed out.
> A technicality: Houses in the US are normally fed with 240 volts single
> phase center-tapped, on three wires. One wire is the neutral or ground,
> and the other two wires each carry 120 volts relative to ground, with 240
> volts between the two live wires. The 240 is used for running heat
> pumps, air conditioners, and some clothes dryers and water heaters. The
> 120 is used for most everything else. So when the two live wires are
> each carrying 200 amps, which is what the 200 amp rating means, the total
> power is 240 volts x 200 amps, or nominally 48 KW, assuming unity power
However most houses do not have unity power factor, and they also have harmonic distortion as well, which adds additional load. Typical residential power factor is around 50% inductive. Additionally, most loads are not balanced between the two hot wires, so you waste capacity there as well. Typical operating loads are only a few kilowatts per house.