Cardboard is not a good conductor of electricity. In fact, it is an insulator, which means that it does not allow electricity to flow through it easily. This is because cardboard is made up of cellulose fibers, which are very poor conductors of electricity. In addition, cardboard often contains other materials, such as glue and ink, which can also act as insulators. As a result, cardboard is not a good choice for use in electrical applications where good conductivity is required.