In a parallel circuit, there are two main variables that determine how much current passes through each branch: resistance and voltage. Each branch has the same amount of resistance, so the total amount of resistance in the circuit is equal to all the resistances added together.
The total amount of voltage across all branches is equal to the sum of all voltages across individual branches. This means that for any given amount of voltage and resistance in a parallel circuit, there will be a single current flowing through all branches.
In other words, adding another branch to an existing parallel circuit does not change its overall current flow or voltage drop.
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Last modified: October 9, 2022