• R1 and R2 are both connected in series with each other, in terms of their connections via Net 1 and Net 2.
• This series combination of R1 and R2 is then connected in parallel with R3.

1. Series Combination:
   The equivalent resistance of resistors in series is the sum of their resistances: $R_{\text{series}} = R_1 + R_2 = 500\,\Omega + 500\,\Omega = 1000\,\Omega$
2. Parallel Combination:
   The equivalent resistance of resistors in parallel is given by: $\frac{1}{R_{\text{eq}}} = \frac{1}{R_{\text{series}}} + \frac{1}{R_3}$
   Substituting the values:
   $$\frac{1}{R_{\text{eq}}} = \frac{1}{1000\,\Omega} + \frac{1}{500\,\Omega}$$

Python
# Values of resistors in ohms
R1_R2_series = 1000  # R1 and R2 in series
R3 = 500  # R3

# Equivalent resistance calculation for parallel connection
R_eq = 1 / (1 / R1_R2_series + 1 / R3)
R_eq