We present a simple experiment to verify the work-energy theorem in electric and magnetic fields to develop engineering students’ learning and research capacity. An electron is accelerated by a voltage U from rest. Next, the electron is put into a uniform magnetic field generated by a constant current I. Under the effect of the magnetic force acting as a centripetal force, the electron moves uniformly in a circular orbit, radius r. The work of the electric force is proportional to U, the work of the magnetic force is 0, while the final kinetic energy of the electron can be determined through I and r. Hence, the relationship between the kinetic energy change and the external force’s work can be verified. We built the experiment and performed investigations. The obtained experimental results demonstrate that the work-energy theorem is correct.We present a simple experiment to verify the work-energy theorem in electric and magnetic fields to develop engineering students’ learning and research capacity. An electron is accelerated by a voltage U from rest. Next, the electron is put into a uniform magnetic field generated by a constant current I. Under the effect of the magnetic force acting as a centripetal force, the electron moves uniformly in a circular orbit, radius r. The work of the electric force is proportional to U, the work of the magnetic force is 0, while the final kinetic energy of the electron can be determined through I and r. Hence, the relationship between the kinetic energy change and the external force’s work can be verified. We built the experiment and performed investigations. The obtained experimental results demonstrate that the work-energy theorem is correct.