Final answer:
When cutting power cables in a non-electric vehicle, the proper order is to cut the negative cable first, then the positive, to prevent short circuits and ensure safety. the correct answer is C. the negative first, then the positive.
Step-by-step explanation:
The correct procedure when cutting power cables in a non-electric vehicle is to cut the negative first, then the positive. This is important because it reduces the risk of creating a short circuit that could cause an electrical arc, potentially leading to injury or fire. Cutting the negative cable first breaks the circuit and makes the system safe, as it effectively removes the return path for the electrical current.
Moreover, when electrons flow in a circuit, they move from the negative terminal to the positive terminal. By disconnecting the negative side first, any accidental contact between the cutting tool and the vehicle chassis will not result in a complete circuit since the chassis is typically connected to the vehicle's negative return system.
Also, when working with high-power electric circuits, working one-handed is advised to prevent the current from passing through the heart if an accidental pathway through the body is established. Using the back of the hand to test for voltage ensures that if a muscle contraction were to occur due to electric shock, it would pull your hand away from the source rather than causing you to grip it tighter.