Final Answer:
The last connection in jumper cables (Option d - Spark) occurs when completing the circuit, leading to a sudden flow of electrical current and the expected spark. Therefore, the correct answer is option d) Spark.
Step-by-step explanation:
The occurrence of a spark when making the last connection with jumper cables is a common phenomenon and is primarily due to the completion of the electrical circuit between the two vehicle batteries. When connecting jumper cables, the final connection completes the circuit, allowing electrical current to flow from the charged battery to the discharged one.
The spark is a result of the electrical potential difference between the two batteries, and it is not necessarily an indication of a problem. It is a natural consequence of the electrical current flowing to equalize the charge between the two batteries.
While a spark is expected, it's important to note that precautions should be taken to minimize the risk of sparks near the battery, as hydrogen gas released during charging could pose a safety hazard.
In summary, the spark that occurs during the last connection is a normal part of the jump-starting process and is attributed to the flow of electrical current between the batteries.
It underscores the importance of following safety guidelines during jump-start procedures to ensure a secure and effective process without any unnecessary risks.
Therefore, the correct answer is option d) Spark.