Maybe this site will help.
https://web.pa.msu.edu/courses/2000fall/PHY232/lectures/rccircuits/examples.html
Consider the circuit shown (in the link below), determine the time required for the capacitor to reach a full charge
where:
DC = 10V
R= 10 KΩ
C= 100 uF
h ttps://slate.sheridancollege.ca/d2l/common/viewFile.d2lfile/Database/OTYyMzQ2/Quiz%20_7%20Question%20_2.png?ou=663593
there's no space between h and ttps
my answer:
10 KΩ = 10x10^3Ω
100 uF = 0.0001F
T=RC
T= (10*10^3 Ω)(0.0001f)
T= 1s
but the solutions at the back says 5.00 s
2 answers
t = 5*RC.