On Sat, 10 May 2014 22:09:58 +0100, Ian Field wrote:



"Uncle Peter" wrote in message
news
On Sat, 10 May 2014 16:52:02 +0100, Brian Gregory
wrote:

On 09/05/2014 23:56, Uncle Peter wrote:
If you built a circuit with a big inductor and a big capacitor in
series, such that the resonant frequency was 50Hz, then connected it to
the mains, would you get current flowing 180 degrees out of phase with
the voltage, and run the meter backwards?

No.

You'd just blow a fuse somewhere (or the inductor or capacitor would
blow) since you've just connected something that's a dead short at 50Hz
across 50Hz mains.

In that case what about the above in series with a load?

You need a really huge permanent magnet clamped on the electricity meter so
the V & I coils saturate their cores on alternate half-cycles.

It's a digital meter :-/

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