Final answer:
The term for when more current flows through a line than it is designed to handle is called "overloaded." This can lead to dangerous situations, such as overheating and fire, and is why electrical systems have safety features like fuses and circuit breakers.
Step-by-step explanation:
More electrical current flowing through a line than the line is designed to carry is referred to as "overloaded". An overloaded line means the current exceeds the maximum rating that the line can safely manage without risks such as overheating or fire. This can happen if the appliance or wire draws or is subjected to more current than it is meant to carry, potentially leading to danger and damage.
One example provided mentioned a current of 25.0 KA producing a power delivery of 50.0x109 Watts, which is much higher than what standard transmission lines are designed for, thus significantly overloading it. Electrical systems are equipped with protective measures like fuses and circuit breakers to prevent or mitigate damage caused by circuit overloads.