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13 years ago
-- I hadn't noticed it.
measuring ac wattage from ampere
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13 years ago
-- After reading this thread through a couple of times, (after a little prodding from the new Italian influence) it appears that I misread what you were saying, and that you were right and I was wrong with reference to the upper limit of the power measurement. Of course, with a power factor of 1, EI will yield watts. However, if the power factor is less than 1, EI will yield volt-amperes, and the real power will always be less than EI.
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13 years ago
John Fields:
Honoured. Truly.
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13 years ago
So get a 240 volt version:
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13 years ago
Turn of every other appliance and observe the watt-hour meter on your supply. it have be written on it how many pulses of the LED (or turns of the rotor) is one watt hour, so count them for a timed duration and do some arithmetic.
This method is somewhat inconvenient if frequent measurements are needed but for a one-off on a tight budget it seems ideal.
-- ??pun u?op ?o?? s?u??????
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13 years ago
That will get you the wrong answer most of the time, especially when electronics are involved.
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-- ??pun u?op ?o?? s?u??????
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13 years ago
Thanks,
I tried the power company meter method, I have rather primitive meter which has a rotating disc. It had a resolution of 100 spins per kwatt hour. So I connected a 100 w bulb and It spun once in 6 minutes. Surely the maths adds up. 10 spins for 100w hr. ..so it should spin once in six mins for a 100 watt load.
This way I could profile a lot of things.
Thanks to all.
Suraj
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