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Re: [Phys-l] glassware needed

Sad to tell, though spinning disk watt-hour meters of the kind used to meter
domestic consumption are required to register within 4% at low loads
and 3% at higher, even inductive loads - they suffer just the same
deficit as the style of meter that loses narrow power consumption spikes of
naive experimenters - it's still a bandwidth issue.

Variacs are helpful for maintaining power waveforms - but they don't come


At 09:20 PM 1/1/2009, you wrote:
This allows me to advertise my collection of aquarium heaters for
very little $. ... Aren't variable auto transformers (Variac) in plentiful
supply? AND at one time (now too?) watt-hour meters were offered by
surplus houses. Since they operate on the principle of one part of
the motor sensing the potential and the other the current, no problem
w/ PF.

Brian Whatcott Altus OK Eureka!