<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <Ol> <Li> Charging: cylindrical drum is electrostatically charged by a high voltage wire called a corona wire or a charge roller . The drum has a coating of a photoconductive material . A photoconductor is a semiconductor that becomes conductive when exposed to light . </Li> <Li> Exposure: A bright lamp illuminates the original document, and the white areas of the original document reflect the light onto the surface of the photoconductive drum . The areas of the drum that are exposed to light become conductive and therefore discharge to the ground . The area of the drum not exposed to light (those areas that correspond to black portions of the original document) remains negatively charged . </Li> <Li> Developing: The toner is positively charged . When it is applied to the drum to develop the image, it is attracted and sticks to the areas that are negatively charged (black areas), just as paper sticks to a balloon with a static charge . </Li> <Li> Transfer: The resulting toner image on the surface of the drum is transferred from the drum onto a piece of paper with a higher negative charge than the drum . </Li> <Li> Fusing: The toner is melted and bonded to the paper by heat and pressure rollers . </Li> </Ol> <Li> Charging: cylindrical drum is electrostatically charged by a high voltage wire called a corona wire or a charge roller . The drum has a coating of a photoconductive material . A photoconductor is a semiconductor that becomes conductive when exposed to light . </Li>

What is the role of a drum in a photocopier
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