Parallel circuit.

The parallel electric circuit is a connection where the input terminals of all connected devices coincide with each other, as do their output terminals, this forms various paths that can be taken by the energy atoms.
characteristics
They share that they are already connected directly from the source.
Σ = V1 + V2 + V3
The value of its resistances is varied, since the current goes through the different paths that exist, but the total intensity is given by the sum of each of them.
It = I1 + I2 + I3 ... + In
That its value is equal to the inverse of its resistances.
R = 1 / (1 / R1 + 1 / R2 + 1 / R3 ... 1 / Rn)

Particularities of the resistances in parallel
a) When you have only resistances.
Rt = R1R2 / R1 + R2

b) For n resistances of the same value;

Rt = R / N
Where;
R is the value of the resistances and the number of them.