What is the differance between negative dc voltage and positive dc voltage because some circuit uses -24,-5,-12,- 15,volt dc supply
10 37112We wish to test 60 Hz systems from a 50 Hz supply. To acheive frequency conversion, we use a VFD. The VFD powers 40 kVA transformer, which has motor and non-motor loads on it. Will the transformer work?
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Maybe you can help.... I use excel not for calculation but for maintaining large mailing lists which I usually import from text files.simple question... How do I keepexcel from dropping the leading zero when I import a 4-digit mail code? I need that zero there. I understand that I can format the cells to text and then type thenumber in and the zero stays... But who has time for that? Is there a way to import or open a text file in excel and keep the leading zero?
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