CR104B Vehicle Electrical and Mechanical Systems Practice Test 2026 - Free Practice Questions and Study Guide

In a parallel circuit, the supply voltage across each branch stays the same, and the currents in all branches add up to give the total current drawn from the source. When you connect another device in parallel, it creates a new branch that draws its own current. The source must supply that additional current, so the total current increases by the amount that the new device draws. The voltage across every branch remains the same (assuming an ideal source). This is why the total current rises whenever a new parallel path with its own current draw is added.