CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Electric battery. Lead-acid battery of the type used to provide electricity in vehicles. The battery consists of a number of connected electric cells. Each cell contains a lead-dioxide plate and a lead metal plate, both immersed in sulphuric acid. The lead metal acts as a negative electrode, dissociating into electrons & positive lead ions. The electrons can be used to provide an electric current whilst the ions react with the acid. When the electrons arrive at the positive, lead- dioxide plate they cause another reaction with the acid. The battery runs down as the plates react with the acid but can be recharged by applying an electric current which reverses the reactions.
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