Electrocution is death caused by electric current passing through the body. While many people use the word loosely to describe any electric shock, the technical meaning refers specifically to a fatal outcome. Some medical experts extend it to include serious injury, but an electric shock that causes no lasting harm is not electrocution. The distinction matters because the same household outlet that gives you a mild jolt under one set of conditions can kill you under another.
Why Small Amounts of Current Can Kill
Voltage gets most of the attention, but current (measured in milliamps) is what actually damages tissue and stops the heart. The threshold for triggering a fatal heart rhythm called ventricular fibrillation is remarkably low. Research published in Circulation Research found that alternating current at the standard 60 cycles per second common in U.S. household wiring can induce fibrillation at roughly 0.5 milliamps when sustained for just five seconds. For context, a typical household circuit delivers thousands of milliamps.
Ventricular fibrillation is a chaotic, uncoordinated quivering of the heart muscle that prevents it from pumping blood. Once it starts, the heart cannot reset itself without CPR or a defibrillator. This is the most common immediate cause of death in electrocution. Higher currents can also cause direct cardiac arrest, where the heart simply stops contracting altogether.
How Your Body’s Resistance Changes Everything
Your skin is the main barrier between an electrical source and your internal organs, and its resistance varies enormously. A calloused, dry hand can have resistance above 100,000 ohms, which limits how much current flows inward. But your internal tissues, which are wet and salty, offer only about 300 ohms of resistance. The skin is essentially the gatekeeper, and several things can compromise it.
Moisture is the most common factor. When skin is wet or a person is immersed in water, total body resistance drops to around 300 to 400 ohms, nearly eliminating the skin’s protective role. This is why electrical accidents in bathtubs, swimming pools, and rain-soaked job sites are so often fatal, even at voltages that would be survivable with dry skin. Cuts, abrasions, and open wounds bypass skin resistance the same way. At 500 volts or above, the current itself breaks down the outer skin layer, creating tiny pinhead-sized entry wounds that allow massive current to flow into deeper tissue.
AC vs. DC: Different Dangers
Alternating current (AC), the type delivered by wall outlets, causes sustained muscle contraction known as tetany. This can lock a person’s hand around a wire or tool so they physically cannot let go, prolonging exposure and increasing the chance of fatal injury. Direct current (DC), common in batteries and some industrial settings, tends to cause a single convulsive jerk that often throws the person away from the source. Being thrown clear is violent and can cause broken bones or head injuries, but it also ends the exposure quickly.
Because AC forces prolonged contact, it is generally considered more dangerous at the voltages found in homes and workplaces, even though DC can also be lethal at sufficient levels.
What Happens Inside the Body
Electrical injuries cause damage far beyond what’s visible on the skin. Current travels through the path of least resistance, which typically means nerves, blood vessels, and muscles. These tissues heat up as current passes through them, and the damage can extend deep into the body even when the surface wound looks minor.
One of the most serious internal consequences is widespread muscle destruction. When electrical current damages muscle fibers, the cells rupture and release a protein called myoglobin into the bloodstream. The kidneys try to filter this protein out, but myoglobin clogs the tiny filtering tubes inside the kidney and triggers inflammation. The resulting kidney injury can progress to full organ failure if not treated aggressively with fluids. This chain of events also floods the bloodstream with potassium and lactic acid from the destroyed muscle cells, which can cause additional heart rhythm problems even after the initial shock is over.
Types of Electrical Burns
Not all electrical burns involve direct contact. Arc burns happen when current jumps from a high-resistance area to a low-resistance area through the air, ionizing the air particles in between. No physical contact is needed. These arcs generate extreme heat and explosive pressure that can ignite clothing and throw a person across a room. Flash burns are related: they occur when an electrical arc passes over the skin surface, causing severe damage to the outer layers without necessarily injuring deeper tissue. Flame burns happen when the electrical current ignites nearby objects or clothing, and the person is burned by the resulting fire rather than the electricity itself.
Long-Term Effects in Survivors
People who survive serious electrical injury often face neurological problems that can appear weeks or months later. A large register-based study found that electrical shock survivors had increased rates of epilepsy, seizures, abnormal involuntary movements, chronic headaches, migraines, and vertigo. Nerve damage in the arms and legs was especially common, likely because the hands and feet are typically the entry and exit points of the current. This nerve damage showed up as numbness, tingling, pain, or weakness in a single nerve or nerve group.
The study did not find increased rates of degenerative diseases like Parkinson’s or multiple sclerosis, which is reassuring for survivors worried about long-term brain deterioration. However, changes in sensation, chronic pain, and difficulty with concentration and memory are well-documented complaints in the years following a significant electrical injury.
How Often Electrocution Happens
In occupational settings, the Bureau of Labor Statistics recorded 130 worker deaths from electrical exposure in 2024. Electrical injuries consistently rank among the top causes of workplace fatalities in construction and maintenance trades. Residential electrocutions add to the total but are tracked less systematically. Common scenarios include contact with overhead power lines, faulty wiring, damaged appliances, and electrical equipment used near water.
What to Do If Someone Is Being Shocked
The most important rule is to avoid becoming a second victim. Do not touch someone who is still in contact with an electrical source, because the current will pass through you as well. If you can safely reach the power source, turn it off. If not, use a dry, non-conducting object (cardboard, plastic, dry wood) to push the person or the electrical source apart. Never approach downed high-voltage power lines; wait for the utility company to cut power.
Once the person is free of the source, check for breathing and a pulse. If there are no signs of circulation, start CPR immediately. Electrical injuries can cause cardiac arrest that is reversible with prompt chest compressions and defibrillation. Even someone who seems fine after a shock should be evaluated if they experienced confusion, muscle pain, heart palpitations, difficulty breathing, or loss of consciousness, because internal damage and delayed heart rhythm problems are not always obvious from the outside.