SOLUTION

Humans are more vulnerable to electric shock from current at 25 Hz compared to higher frequencies.

Why lower frequency currents are more dangerous for the human body?

• Lower Impedance:

  • The human body’s impedance (resistance to electrical current) decreases at lower frequencies. This means that at 25 Hz, the body offers less resistance to the flow of current, allowing a greater amount of current to pass through.
  • Higher current flow increases the risk of serious effects like ventricular fibrillation (a dangerous heart rhythm) or tissue damage.

• Longer Pulse Duration:

  • Frequency refers to the number of cycles per second of an alternating current (AC). Lower frequency means each cycle takes longer.
  • This longer duration of each pulse of current can have a greater impact on tissues and nerves, increasing the potential for harm.