This converts the lead sulphate back to the original materials of lead dioxide and porous lead.Īs the battery becomes charged, the electricity begins to decompose (hydrolyse) the water in the electrolyte into its constituent elements of hydrogen and oxygen, which are released as gas. This causes the battery to discharge, which results in the chemical composition of both the electrodes changing to lead sulphate.Ī battery can be charged by putting a current through the battery from an outside source of electricity such as an alternator, dynamo or charging unit. When an electrical load (for example lights or a starter-motor) is connected across the battery, a current flows through the electrolyte in the battery and through the external load. The positive electrode is made of lead dioxide and the negative electrode is made of porous lead. ?Primary batteries can be discharged only once and then have ?to be thrown away examples are some types of torch and ?radio batteries. Lead-acid batteries are secondary batteries, which means that they can be recharged after they have been discharged. Most Yuasa batteries are lead-acid batteries, which means that they have positive and negative electrodes made of lead compounds in a dilute sulphuric acid electrolyte. A battery is a device for storing electrical energy in a chemical form, and then releasing it as direct current in a controlled way.Īll types of batteries contain a positive and a negative electrode immersed in an electrolyte, the whole assembly being within ?a container.
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