Question

on which princple does electric fly trapper work

Answer 1

bug zapper, more formally called an electrical discharge insect control system, electric insect killeror (insect) electrocutor trap, is a device that attracts and kills flying insects that are attracted by light. A light source attracts insects to an electrical grid, where they are electrocuted by touching two wires with a high voltage between them. The name comes from the characteristic onomatopoeic zap sound produced when an insect is electrocuted.