IBEW Apprenticeship 2nd Year, 1st Period (2-1) Practice Test

Adding parallel loads to a circuit decreases the total circuit resistance instead of increasing it. When loads are connected in parallel, each load provides an alternative path for the current to flow. This effectively increases the total current-carrying capability of the circuit, which results in a reduction in total resistance according to Ohm's Law. In mathematical terms, the total resistance (R_total) for resistances in parallel is given by the formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ... This equation illustrates that as more resistances are added in parallel, the overall reciprocal of the total resistance becomes smaller, leading to a lower total resistance. Therefore, it is false to say that adding parallel loads will increase the total circuit resistance; rather, it lowers it, allowing for greater total current flow in the circuit.