Excuse me for any incorrect terminology as the details of what is actually going on in my experiments are still hazey . Hopefully i will be able to get my question across clear enough.
Okay here goes.
In my beginners book, i have been going through an exercise where you place a resistor in series with a capacitor and measure the voltage across the capacitor at regular intervals.
From a set of results you can draw a graph which shows an exponential curve. I am happy with this and it all adds up as far as the product of resistance and capacitance following some law.
Then my book says do a similar test but this time with no resistor and charge the capacitor fully first then measure the voltage drop over regular intervals.
Apparently there is supposed to be another exponential curve showing that the voltage across the capacitor drops more quickly at first then slows down.
With a 22 micro farad capacitor the voltage should drop to 0.7 within 1 minute.
When i did the test there was still a fair ammount of voltage well after a minute.
Any ideas what i may be doing wrong or does this experiment just not work with any accuracy?
Thanks Marks.
Okay here goes.
In my beginners book, i have been going through an exercise where you place a resistor in series with a capacitor and measure the voltage across the capacitor at regular intervals.
From a set of results you can draw a graph which shows an exponential curve. I am happy with this and it all adds up as far as the product of resistance and capacitance following some law.
Then my book says do a similar test but this time with no resistor and charge the capacitor fully first then measure the voltage drop over regular intervals.
Apparently there is supposed to be another exponential curve showing that the voltage across the capacitor drops more quickly at first then slows down.
With a 22 micro farad capacitor the voltage should drop to 0.7 within 1 minute.
When i did the test there was still a fair ammount of voltage well after a minute.
Any ideas what i may be doing wrong or does this experiment just not work with any accuracy?
Thanks Marks.