ARRL Technician Practice Exam

How does current flowing through the body cause a health hazard?

1. It can cause electrical burns

2. All of these choices are correct

3. It can cause muscle spasms

4. It can disrupt heart rhythms

The correct answer is: All of these choices are correct

Current flowing through the body poses significant health hazards due to the various harmful effects it can have on biological tissues. When electrical current passes through the body, it can lead to electrical burns, which occur as a result of the heat generated by the current as it encounters resistance in bodily tissues. These burns can be severe, leading to significant injury or damage to skin and internal organs. Additionally, the flow of current can induce muscle spasms. When electrical signals disrupt normal muscle function, they can cause involuntary contractions, which may prevent a person from escaping further contact with the source of electricity. One of the most critical dangers is the disruption of heart rhythms. The heart relies on electrical signals to maintain a steady rhythm, and when external current flows through the body, it can interfere with this process. This interference can lead to arrhythmias, which can be life-threatening. Overall, these various hazards illustrate the profound and potentially fatal effects that electric current can have on the human body, emphasizing the importance of safety when working with or around electrical systems.