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You need to measure much more than electrical power. And even measuring electrical power is far more complex than you comprehend.
If and only if you are using DC, and your entire set up is purely resistive (no capacitors, no inductors, no stray capacitance due to twin-leads), then you can use NachoMahma's method of measuring voltage and current and multiplying.
If you are using AC power, or if you have any capacitance or inductance in your system, then you cannot simply multiply volts and amps. You must measure the two quantities simultaneously, in a time resolved way, and you must measure the phase difference between the two. If you don't know what I'm talking about here, then you'd better do some serious (undergraduate electrical engineering) research.
In addition to measuring electrical power in your experiment, you must measure heat (not just temperature, but heat), and you must have sensitive detectors, preferably with full 4-pi coverage, for gammas and for neutrons.
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Posted:Jul 23, 2010
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