AnthonyR23
New Member
Hi, I have a question about a new formula that just came up in a chapter I am studying... it is to determine the time elapsed between a switch closing and the control relay energizing. It is found using the following equation:
t = R1 C1 ln 1/1-η
where t = elapsed time, in seconds
R1 = resistance, in ohms
C1 = capacitance, in farads.
η = intrinsic standoff ratio of UJT
so I have a question and answer: with diagram but you guys can probably help without having to see the diagram:
I am trying to find t
20 k ohms for R1
1000 µF for capacitance
0.75 for η
The answer is t = 27.7 seconds
I don't know what ln is in the equation is so that is probably is why I can't figure it out, and can't find that anywhere in the chapter.
So if anyone can explain the ln in this equation that would be awesome!!!! Thanks guys!!
t = R1 C1 ln 1/1-η
t = R1 C1 ln 1/1-η
where t = elapsed time, in seconds
R1 = resistance, in ohms
C1 = capacitance, in farads.
η = intrinsic standoff ratio of UJT
so I have a question and answer: with diagram but you guys can probably help without having to see the diagram:
I am trying to find t
20 k ohms for R1
1000 µF for capacitance
0.75 for η
The answer is t = 27.7 seconds
I don't know what ln is in the equation is so that is probably is why I can't figure it out, and can't find that anywhere in the chapter.
So if anyone can explain the ln in this equation that would be awesome!!!! Thanks guys!!
t = R1 C1 ln 1/1-η