How does electricity harm the human body?

Answer 1

It can stop the heart leading to heart failure, Death. It can also cause burns varying in density from grade 1 to grade 3 depending on the voltage. It can cause brain failure/damage. It can/will cause the cells in the immediate vicinity to die leading to rashes, open wounds and tissue damage.

Overall it can cause extreme damage and result in death depending on the amount of the current.