R3 and R2 are in parallel
A parallel circuit is one where the current flows through multiple branches, while a series circuit is one where the current flows through each component in a single path.
To calculate the total resistance in a parallel circuit, you can use the formula 1/Rt = 1/R1 + 1/R2 + 1/R3 + ..., where Rt is the total resistance and R1, R2, R3, etc. are the individual resistances in each branch.
In a series circuit, the total current is the same at all points, so you can calculate it using Ohm's law: I = V/R, where I is the current, V is the voltage, and R is the total resistance.
If one branch is removed in a parallel circuit, the current in the remaining branches will increase because there is less total resistance for the current to flow through.
In a parallel circuit, the current is split between multiple branches, so each branch has a lower resistance and therefore more current can flow through. In a series circuit, the total resistance is equal to the sum of the individual resistances, so there is less current flowing through each component.