Very shallow, superficial burns cause only reddening while deeper burns may produce blistering, or destruction through the entire layer of skin down to the subcutaneous tissue. This picture shows 2nd and 3rd degree burns covering most of the body. Burns are difficult to treat and may require multiple surgeries over a period of years. First degree burns produce only reddening of the skin. Second degree burns produce blistering, as seen here.
Electricity can instantaneously destroy tissue.
This child has a burn that resulted from biting on an electrical cord. These burns often occur at the corners of the mouth, as seen here. Third degree burns cause tissue death through the dermis and affect underlying tissues.