- #1
will.i.am2
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A capacitor and resistor are connected as shown across a 10V d.c. supply. The voltage across the capacitor will increase at an exponential rate given by the equation
v = V - Vet/CR
a) Plot the graph of the capacitor voltage from the equation for values of t between 0 and 24 seconds.
vc = V (1-et/CR) , V = 10v, Capacitor = 100µF, Resistor = 47kΩ
CR = 100µF times 47kΩ = 4.7
done part a. but I need someone to check it for me please?
(b)From the graph determine its gradient at t = 5 seconds.
I have done the graph and after calculating it; it gives me a gradient of -10? I don't know if that's the right answer.
(c) Using calculus determine the gradient of the equation and from this the gradient when t = 5 seconds.
I have attempted it my way and I am not getting the right answer. I have been told by the teacher that the answer should be in minus and both gradient answer should be close.
So, any help would be appreciated.
thanks
v = V - Vet/CR
a) Plot the graph of the capacitor voltage from the equation for values of t between 0 and 24 seconds.
vc = V (1-et/CR) , V = 10v, Capacitor = 100µF, Resistor = 47kΩ
CR = 100µF times 47kΩ = 4.7
done part a. but I need someone to check it for me please?
(b)From the graph determine its gradient at t = 5 seconds.
I have done the graph and after calculating it; it gives me a gradient of -10? I don't know if that's the right answer.
(c) Using calculus determine the gradient of the equation and from this the gradient when t = 5 seconds.
I have attempted it my way and I am not getting the right answer. I have been told by the teacher that the answer should be in minus and both gradient answer should be close.
So, any help would be appreciated.
thanks