http://www.allaboutcircuits.com/vol_1/chpt_16/4.html
About midway down the page reads, "Since we started at a capacitor voltage of 0 volts, this increase of 14.989 volts means that we have 14.989 volts after 7.25 seconds."
This should be"...increase of .989 volts..."

 

A RC time constant of 1 second, and a capacitor reaches 99% of it's charge in 5TC, I think you can see where your logic is in error.

In this case the capacitor reaches 0.99929 of its value in 7.25 TC, but remember, this is not the percentage, the percentage is 99.929% of the total charge of 15V.

If you would like to continue this conversation please register, and post in the other forums. It is easy to do.

 

You're right, i read it wrong and didn't check it before posting. sorry bout that.

 

Have you checked the rest of the book, or forum?

If this is an interest, you could add to the membership. Thought of registering?


Its only 799.95. But this era only we are offering a 799.95 off instant rebate.