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astro2525
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[Mentor's note: this thread does not use the standard homework-help template because it originated in a non-homework forum. It was moved here instead of being deleted because it had already gotten significant help.]
"A capacitor is being charged from a battery and through a resistor of 20 KOhms. It is observed the the voltage on the capacitor rises from 10% of its final value to 90%, in 15 seconds. Calculate the capacitor's capacitance."
I know we are supposed to show an attempt at a solution, but I'm not even sure where to start with this one :/. I know I need to be able to find the time constant from the data given, and from there tau = RC, but I don't know how to incorporate the percentage difference. I just need a push in the right direction
"A capacitor is being charged from a battery and through a resistor of 20 KOhms. It is observed the the voltage on the capacitor rises from 10% of its final value to 90%, in 15 seconds. Calculate the capacitor's capacitance."
I know we are supposed to show an attempt at a solution, but I'm not even sure where to start with this one :/. I know I need to be able to find the time constant from the data given, and from there tau = RC, but I don't know how to incorporate the percentage difference. I just need a push in the right direction
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