Question

1. A resistor with resistance R = 30 MΩ is connected in series with a capacitor with capacitance 3 μF. What is the

time constant?

2. Determine the equivalent (total) resistance for each of the following circuits below.

Answer 1

Answer

1.the time constant is given by

$\tau=RC\\=30*10^6*3*10^{-6}\\=900sec$

2.the equivalent (total) resistance for each circuit using

If in series then

$R_T=R+R'+R"+.....$

If in parallel

$\frac{1}{R_T}=\frac{1}{R}+\frac{1}{R'}+.......$