Question

derive the formula parallel resistances?

Answer 1

Voltage(v) is same in parallel connection
I = I 1 + I 2 + I 3
using ohms law
V = I R eq
I = V÷ R eq
V ÷ R eq = V/ R1 + V/R2 + V/ TE
1 / R eq = 1 / R2 + 1 / R2 + 1/ R2
This is the equation.
R eq means equivalent Resistance
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Answer 2

$\textbf{Answer is in Attachment !}$