Posted by Stephanie on Wednesday, March 10, 2010 at 6:30pm.
A 9Volt battery is used to charge a 280 mF capacitor over a 81 Ohms resistance.
How long will it take for the capacitor to reach 75% of its maximum charge?
What formula is relevant?

Physical Science  sam, Wednesday, March 10, 2010 at 10:26pm
charging the capacitor formula;
Q=Q max (1e ^t/RC)
Q=qmax= 0.75
solve for t

Physical Science  anony mouse, Thursday, March 11, 2010 at 3:42pm
So the Voltage is irrelevant?

Physical Science  Sandra, Thursday, March 11, 2010 at 10:25pm
Why wouldn't you use this formula?
Q=Qmax*e^(t/RC)
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