So for example, if I have a capacitor at 10v and I want a voltage drop of no more than 0.1v over a time period of 10 microsecond, powering a 1w load, what must the capacitance of the capacitor be to start with?
Power P = V x V /RSo for example, if I have a capacitor at 10v and I want a voltage drop of no more than 0.1v over a time period of 10 microsecond, powering a 1w load, what must the capacitance of the capacitor be to start with?
So is 10uF the amount of drop of capacitance that a 0.1 drop of voltage cause in that time period (10 microseconds)?Using the formula provided by eric
C = t x I / V = 10 x 0.1 / 0.1 μF = 10μF
I think you mean 10μs.That is the capacitance required to provide 0.1A of current for 20 microseconds while dropping the voltage by 0.1V
Great - much appreciated Eric.hi Mark,
Graphic plot of the circuit.
E
Yes, which means the capacitor would need to be 1000 times as large, or 10mF for the same voltage drop.If I wanted to calculate this and change it from 10 microseconds to 10 milliseconds would t = 10000 instead of 10?
Sorry. In order to keep the equation simple, I omitted the units.In the equation, why is time (t) not subject to a unit, like uS, mS, S, but is just 10? If I wanted to calculate this and change it from 10 microseconds to 10 milliseconds would t = 10000 instead of 10?
Using the formula provided by eric
C = t x I / V = 10 x 0.1 / 0.1 μF = 10μF
Oh, yes that makes sense.The 10^-6 factor appears in the result as μF.
Because of sloppiness and a preference for refusing to properly track units and, instead, tacking on the units that they hope, want, and expect the answer to have.In the equation, why is time (t) not subject to a unit, like uS, mS, S, but is just 10?
Just use 10 ms.If I wanted to calculate this and change it from 10 microseconds to 10 milliseconds would t = 10000 instead of 10?
In general, yes. I seem to recall that there's an exception, but I can't recall what it is.Capital letter if it's called after a person, lower case if it isn't.
Maybe you're thinking of the rule that says it is not capitalised if written out in full.In general, yes. I seem to recall that there's an exception, but I can't recall what it is.
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