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Joined 1 year ago
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Cake day: June 12th, 2023

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  • How were you measuring the current in the power cable? Is this with a Kill-o-watt device or perhaps with a clamp meter and a line splitter?

    For the current both with a line-splitter+clamp and checked with an in-line meter. For the power factor, since I don’t have any actual instrument to measure It, and I just needed a ball-park figure to discern actual consumption from a capacitor, I used this diy method: https://www.giangrandi.org/electronics/cosphi/cosphi.shtml , which measured 0.04 ( with great approximation ).

    As for why there is a capacitor across the mains input […]

    I have the basic on how a switching power supply work, but I was asking because it seemed weird to me that commercial appliances didn’t take any stand-by meaures to avoid “keeping the wires warm”… is this the norm?





  • Yeah “dissipate away” is probably a bit misleading but I meant that the heat source is mainly the surface since it’s difficult to heat the thin outer layers directly, and from there heat moves up thorough ir radiation or adiabatic expansion. But it’s not like mountains are cooled down by adiabatic expansion, since the air wouldn’t move up without a temperature gradient, which means that it cannot get colder that the mountains already are. So I would think they are simply farther away form surface heat radiation and have thinner air that don’t assorb heat…