Two resistors in parallel

When resistors are in parallel, each one experiences the full battery voltage independently, so you can find the current through each resistor separately using Ohm's law ($I = V/R$), then add them together. The key insight is that parallel resistors split the current based on their resistance—smaller resistance draws more current—but the voltage across each is always the same.

When resistors are in parallel, each one experiences the full battery voltage independently, so you can find the current through each resistor separately using Ohm's law ($I = V/R$), then add them together. The key insight is that parallel resistors split the current based on their resistance—smaller resistance draws more current—but the voltage across each is always the same.