Final answer:
It is true that less than one ampere of electricity can be lethal. Currents roughly above 10 mA can cause muscle contractions, and around 60 mA can induce heart fibrillation, which can be fatal.
Step-by-step explanation:
The statement that less than one ampere of electricity can kill a person is true. While very small currents, typically under 1 milliampere (mA), can pass through the body without being felt, currents of just 10 to 20 mA can cause sustained muscular contractions. Currents at approximately 0.06 amperes, or 60 mA, can be potentially fatal, due to their ability to cause the heart to fibrillate, which is a chaotic heartbeat that can be deadly.
It's important to note that factors such as electrical path through the body, duration of exposure, and frequency of the current also play significant roles in the severity of an electric shock. Safety features in electrical systems, like circuit breakers and three-wire systems with live, neutral, and ground wires, are designed to prevent these dangerous levels of current from causing harm.