Quote:
Originally posted by MadDogMe
Amps were stated as 0.53 (x110= 58.3watts?, 240V x 0.53=127Watts?!!!). are the amps the same regardless of voltage used?...
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P = V * I
This equation is only correct for DC power.
For pure sinusoidal voltage and current AC waveforms the equation is:
P = V * I * cosine(phase)
Motors tend to be highly inductive loads. Because of this, there is a large phase angle between the voltage applied to the pump, and the current flowing through it. Knowing the phase angle is necessary to calculating the power consumption.
There is more on pump power consumption
here.
The following picture shows simultaneous measurements of Volts, Amps, and Watts (as well as VA which is Volts * Amps) for a Danner Mag 5 pump with very low restriction. The pump's power consumption is spec'd at 45 Watts Max.