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#### Formula for 2 parallel resistors `R1`

and `R2`

:

R_{total} = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2}}Python code:

rtotal = 1. / (1./r1 + 1./r2)

#### Formula for 3 parallel resistors `R1`

and `R2`

:

R_{total} = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}}Python code:

rtotal = 1. / (1./r1 + 1./r2 + 1./r3)

#### Formula for 4 parallel resistors `R1`

and `R2`

:

R_{total} = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \frac{1}{R_4}}Python code:

rtotal = 1. / (1./r1 + 1./r2 + 1./r3 + 1./r4)