Which factor most directly determines whether a stun device injures a subject?

Which factor most directly determines whether a stun device injures a subject?

• A. Resistance
• B. Frequency
• C. Voltage
• D. Current

Answer: (D)

Current through the body is the factor that most directly determines injury from a stun device. The device creates a potential difference, but it is the amount of current that actually flows through tissues, nerves, and especially the heart, that determines the level of disruption and potential harm. According to Ohm’s law, current depends on both the voltage and the body’s resistance, so a very high voltage doesn’t guarantee a large current if the resistance is high, and a lower voltage can still push harmful current if resistance is low. The duration of the current also matters, because the energy delivered to tissues grows with time and with the square of the current. Frequency affects how the nerves respond, but it doesn’t by itself set how much injury occurs; the key factor is how much current is flowing through the body and for how long.

Current through the body is the factor that most directly determines injury from a stun device. The device creates a potential difference, but it is the amount of current that actually flows through tissues, nerves, and especially the heart, that determines the level of disruption and potential harm. According to Ohm’s law, current depends on both the voltage and the body’s resistance, so a very high voltage doesn’t guarantee a large current if the resistance is high, and a lower voltage can still push harmful current if resistance is low. The duration of the current also matters, because the energy delivered to tissues grows with time and with the square of the current. Frequency affects how the nerves respond, but it doesn’t by itself set how much injury occurs; the key factor is how much current is flowing through the body and for how long.