Parallel circuit rules

• Components in a parallel circuit share the same voltage. E_total = E₁ = E₂ = . . . E_n
• Total resistance in a parallel circuit is less than any of the individual resistances. R_total = 1 / (1/R₁ + 1/R₂ + . . . 1/R_n)
• Total current in a parallel circuit is equal to the sum of the individual branch currents. I_total = I₁ + I₂ + . . . I_n