Recent content by Johnstonator

  1. Johnstonator

    What would be the ideal cross section of an axially loaded cantilever beam?

    Pretty much the title. Just some brain teasers I'm trying to figure out. I can't think of how a cross section would come into play when it comes to axial loading. Buckling? Since the critical force for buckling is proportional to moment of inertia, so theoretically if I have a high moment of...
  2. Johnstonator

    Engineering Determining if voltage or current is positive or negative with sources

    I think I see it. iΔ only applies when I have Vs =##\alpha## iΔ. I forgot to think about that iΔ can be ignored. I want to say use KVL/KCL here but that doesn't seem right to me?
  3. Johnstonator

    Engineering Determining if voltage or current is positive or negative with sources

    ##\alpha## is 400 V/A. Vs =##\alpha## iΔ , where, Vs = -6V, iΔ= -15mA, so ##\alpha## = 400V/A. So it sounds like I can't say iΔ (-15mA) is the value of the current going through the dependent voltage source then?
  4. Johnstonator

    Engineering Determining if voltage or current is positive or negative with sources

    So the main takeaway is that whenever I see iΔ I just have to know that only applies to the dependent voltage source equation (v = alpha* i), and then ignore that for everything else? For the 6V Voltage source, the power would be negative. P = -i v, where i = 15mA, and v = 6V. For the...
  5. Johnstonator

    Engineering Determining if voltage or current is positive or negative with sources

    So I'm confused on a few things about this circuit. I know my math is right (since I got the absolute values correct), but the signs are off since I can't tell when the voltage, current or if the general power equation is positive or negative. A) So my first question is, where is the current...
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