If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal
The Correct Answer and Explanation is:
In an electrical circuit, the current flowing out of a power source, like a battery, will always be equal to the current flowing back into the source. So, if 200 amperes (A) flow from the positive terminal of the battery to operate the starter motor, the same 200 amperes will flow back to the negative terminal.
This principle is rooted in the law of conservation of charge, which states that electric charge is conserved in a closed circuit. In other words, charge cannot simply disappear or accumulate indefinitely within the circuit. When a current of 200 A flows out of the battery, it moves through the load (in this case, the starter motor) and returns back to the battery to complete the circuit. The amount of current that returns must match the amount that left because any imbalance would violate the conservation of charge.
In an automotive circuit, when the starter motor is engaged, it forms a closed path for current flow between the positive and negative terminals of the battery. The starter motor uses this current to produce the mechanical energy needed to start the engine. As the current flows from the battery’s positive terminal, it passes through the starter motor, which creates resistance to the flow and converts electrical energy into mechanical energy. After passing through the motor, the current continues along the return path and eventually reaches the negative terminal of the battery.
If there were any discrepancy between the current leaving and returning to the battery, it would indicate a failure in the circuit, such as a short or break. However, in a properly functioning circuit, the current is conserved. Therefore, 200 A leaving the positive terminal means 200 A will flow back to the negative terminal, ensuring a stable and balanced circuit.