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January 30, 2015

January 30, 2015

Posted by **Rachael** on Friday, March 22, 2013 at 9:13am.

- maths -
**Henry**, Saturday, March 23, 2013 at 5:28pmR = 20K Ohms.

C = 100uF.

R*C = 20*10^3 * 100*10^-6 = 2000*10^-3=

2 s.

E/e^(t/RC) = E-Vc.

40/e^(t/2) = 40-18 = 22

e^(t/2) = 40/22 = 1.8182.

t/2*lne = ln1.8182

(t/2)*1 = 0.59785

t = 1.2 s.

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