Question

9-Volt battery is used to charge a 375 mF capacitor over a 147 Ù resistance.

How many seconds will it take for the capacitor to reach 75% of its maximum charge?

Hint: The equation below represents the charge of a charging capacitor as a function of time

Q max= CV
once you find Q max we can equate it to the formula Q=Q max (1-e ^-t/RC)
what do you do with the 75% do you take 75% of the Q max????????/// confused


bobpursley
yes, Q= .75CV, then use the exponential form to find t.

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