Along with covering every major concept usually found in a DC/AC course, this DC/AC computer lab manual/software package provides students with an interactive way of learning the fundamentals of electricity. The material can be used in vocational and technical schools, community colleges and some four-year curricula. In addition to placing the teacher in a more productive position, the interactive learning programme helps students learn from a more confident standpoint. When a student makes a mistake the word "error" appears on the computer screen and can be erased at the touch of a button. In comparison with a standard teaching environment, this personal-learning atmosphere encourages students to take risks in mastering new material. The programme also features a score card, which evaluates the students' progress interactively, and troubleshooting exercises, which many students find especially appealing.