A bug zapper is an electrical discharge insect control system, electric insect killer or (insect) electrocutor trap. It attracts mosquitoes and other insects with the help of light in an electrical grid. In this grid, they are electrocuted by the touching two wires with a high voltage between them.
The light used to attract mosquitoes and bugs is the ultraviolet light, whose fixture is surrounded by a mesh cage. This cage is energized with a low voltage current. So it’s insects’ and mosquitoes’ attempt to pass this cage which gets them electrocuted.
Bug Zappers are also equipped with collection trays to collect the dead insects. The crackling sound that the zapper makes when infectious mosquitoes are burnt in it, is no less than a music to people’s ears.
Bug Zappers however, are not always effective in killing mosquitoes. The reason behind this is that mosquitoes are only occasionally attracted to the ultraviolet light because their major attraction is the whiff of carbon dioxide which all blood sources emit. So the biting mosquitoes are barely attracted by these bug zappers. Researches have shown that the major part of mosquitoes accumulated in the collection tray of bug zappers are not female mosquitoes, meaning they are not the mosquitoes we actually need to worry about. So bug zappers are mostly killing the non-biting mosquitoes called midges.
Market these days is offering a new type of Bug Zapper which is more effective than the usual ones. This new bug zapper uses carbon dioxide and octenol—a nontoxic, pesticide-free pheromone—to attract mosquitoes. So due to its ability to emit CO2, this bug zapper effectively kill the biting mosquitoes.