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An interesting thing; I think moving coil metres measure RMS and Moving iron measure average voltages and currents and watts even. I have no idea why we have such high voltages or the histroy behind this I would be interested to hear. I understood that when WA (Western Australia) had 254 / 480 V it was because of the long distances involved and they expected to get a certain amount of voltage drop , possibly John can help us outr here. I am not evebn 100 % certain that they don't still have it! But what I would like to explore is the effect of higher frequency, which i think is a good thing and why more countrieds do not go for higher frequencies. I think it is safer and i think fluorescent lighting works a lot better and all inductive devices are much smaller and simpler. ie motors, transformers and chokes. I think the American 60 hz is better than our 50 hz but our 240 V is better than the 117 V in USA etc. I don't even knwo who uses 117 V except , North America and Japan? Please advise. Rgds ian
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