Abstract
Low-voltage sources such as car batteries are generally regarded as being electrically safe. However, they are capable of producing large currents. Any metal object, such as a ring or watch strap, coming into contact with a live terminal and the earthed chassis or casing will short-circuit the battery and will be rapidly heated (Fisher and Dvoretzky, 1976). It may not be possible to remove a hot ring or watch sufficiently quickly to prevent a bum. These injuries would appear to be thermal rather than electrical bums. advice to remove any metal rings or watches whilst working in the vicinity of a battery should be given, in repair manuals for instance, and may help to prevent this injury.
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