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"Ed-" <eddie_nospam@optusnet.com.au> wrote in message
news:4297f96e$0$1228$afc38c87@news.optusnet.com.au...
> next question:
> how can i get the electric meter to turn backwards by using some caps?


You can't.

Capacitors will change the power factor but not the real power(*time) which
the meter measures.
Changing the pf will result in less current and some decrease in losses. If
you have demand metering, then the demand may be reduced.
-- 
Don Kelly
dhky@peeshaw.ca
remove the urine to answer

>
>
> <jan@janhurst.com> wrote in message
> news:42948abb$0$28838$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
> : Hello,
> :
> : I am studying an introductory electronics course and have been given
> the
> : following problem:
> :
> : A small factory has the following loads operating from the 240Vrms
> 50Hz
> : supply
> : a) Forty 50 watts incandescent lamps with unity power factor
> : b) Thirty-five 40 watts fluorescent lamps with a lagging power factor
> of 0.9
> : c) One 2400 watts air conditioning system with a lagging power factor
> of
> : 0.65.
> :
> : I am asked to draw the complete phasor diagram and determine the total
> : peak current drawn and overall power factor of the factory.
> :
> : I'm a little stuck :( I have some phasor diagrams put together which I
> : am a little unsure of, but I don't really know how to determine peak
> : current from this, can anyone shed some light or point me in the
> : direction of some material to explain this sort of problem? I've been
> : digging through a number of text books and am not really progressing.
> :
> : Thank you
> :
> : Jan
>