P

#### Panther

- Jan 1, 1970

- 0

Basically I've done a practical with an RC network and I've got 2 wires that

touch to "complete the circuit" and provide current to the capacitor. I need

to find out the amount of time they've touched by lookign tat the voltage in

the capactiros. I have the capacitor charge/discharge curves.

my question is can I work out the time using simply time constants? 5TCs =

time to charge a capacitor (almost 100%, irrelevant). So because I have the

capacitor charge curve, say it only had half the voltage o fthe input

voltage, and i look up half on the y axis and find wher eit meets, and look

up the x-axis' time and work out how long that is.

or do i do this: http://www.play-hookey.com/dc_theory/rc_circuits.html

basically use that formula. if i do use it i will get more ducks.

are both these methods correct?

thanks