The Total Resistance Calculator is a useful tool for determining the combined resistance of multiple resistors connected in either series or parallel circuits. In a series connection, resistances add directly to give a higher total resistance, while in a parallel connection, the reciprocal of the total resistance equals the sum of the reciprocals of the individual resistances, resulting in a lower overall value. By selecting the connection type and entering resistor values, this calculator instantly computes the total resistance in ohms. It is widely used in electrical engineering, circuit design, and physics education to understand how resistors affect current flow and voltage distribution within a circuit.