I am trying to find the time constant for a circuit.I want to make sure I am doing this right. My resistor is 10K while my capacitor is 5pf. this would give me: T=RC T=10X10^3X5X10^-12 T=10,000X.000000000005 T=.00000005s then .00000005s would convert to .05ns right?
You were right until the last step. 0.00000005s = 50ns I prefer to stay away from all those zeros and use the sum of the exponents. In this case you just do this; 10 x 5 = 50 Now add the exponents; 3 + -12 = -9 ^-9 = nano so it's 50ns
I have oe more question. I am trying to figure out the capacitor coltage after a certain time but I am stuck on using the formula I cant understand it at all. Does anyone know anylinks that explain how to use the formula better? I tried reading the article on this website but it was not any help.
The part that is confusing me is the exponent part where it is t/T. I have no idea how the examples are getting the numbers they are getting in their solution at that part
Small t is the time in seconds at which you want to know the voltage. Big T (actually the greek letter tau) is the RC time constant (T = R x C).
ok I got the formula down. I have one more question I have a problem that says to plot Vc for 0<t<4t using at least for points. what does it mean by this notation of 0<t<4t? I have never seen a problem like this before
t has to be defined before it can be used in this context, so unless they say "t=0.5s" or something then t is meaningless. You sure it's not "T" rather than "t"? "0<t<4t" just means to plot the "t" axis from 0 up to "4 x t".
In your problem, you are going from time zero ( 0 < t ) to four time constants ( 4 tau ) . You were given that tau is 2 mS ... so they wanted the plot to 8 mS.