A "bug zapper" is a device that electrocutes bugs when they come into contact with its electrically charged inner panel. The bug zapper is typically mounted on a hook on the backyard porch so that the members of the house can sit outside and enjoy themselves without fear of being bitten. You can test whether a bug zapper is functioning correctly by observing a number of characteristics that are inherent in its operation. You will need a protective pair of glasses, but otherwise no special equipment.

Step 1

Turn on the bug zapper. Place your ear a few inches away from its outer case. Listen for the distinct "humming" sound that indicates electricity is flowing through the now electrically-charged panel inside the case. Turn the bug zapper off and confirm that the sound is slowly diminishing to indicate that the once-charged grid is losing its electrical charge.

Step 2

Turn the bug zapper on once it has become dark outside. Put on protective goggles to protect your eyes. Look at the color being generated by the electrified grid inside. A bluish color indicates that the zapper is working correctly and will electrocute any bug that enters it.

Step 3

Stand next to the zapper and listen for the "hissing" and "cracking" sound that indicates a bug has entered and has been electrocuted. Stay nearby for an hour to confirm that the sounds are continuing as more bugs are entering and being electrocuted.