I use these task cards to check my students' understanding of conductors and insulators prior to assessment. Prior to the lesson I print these task cards out, laminate, and cut them. Then, students use the two headers (conductors/insulators) and sort the picture cards under each. I then walk around the room and check their work. This could also be used in a center.
No answer key is included. The first two pages of pictures are all conductors and the next two pages of pictures are all insulators.