Inductors store energy in a magnetic field due to the relationship between moving charges and magnetic fields. When current flows through an inductor, energy is expended to establish the current against the induced electromotive force (emf). This energy is stored in the magnetic field created by the inductor. Upon cessation of current, the inductor releases this energy as the reduction in current induces an opposing emf, allowing the energy to be regained. This conceptualization of energy storage in the magnetic field is a practical way to understand the underlying physics.
PREREQUISITESElectrical engineers, physics students, and anyone interested in the principles of electromagnetism and energy storage in electrical components.
In order to build up a current in an inductor, one has to expend energy opposing the induced emf as the current is increasing. As a result of the current being established, the inductor now has a magnetic field. When the current stops, the energy expended in setting up the current is regained. This is because the reduction in current induces an emf that tends to oppose the reduction. The idea that the energy is stored in the magnetic field is just a handy way to conceptualize what occurs.cdotter said:I understand that moving charges generate a magnetic field, but what makes an inductor energy in a magnetic field? Is it just something that is, or is there a physical reason behind it?