What is coil charge?

Coil charge refers to the energy stored in a coil of wire when an electric current flows through it. As current passes through the coil, it creates a magnetic field that stores energy in the form of potential energy. When the current is turned off, the magnetic field collapses and the energy is released back into the circuit in the form of a voltage spike. This phenomenon is called inductive kickback or back EMF (electromotive force). It can produce high voltage spikes that can damage electronic components, so it is important to take measures to protect the circuit from it. In some applications, such as ignition coils in cars or transformers, the coil charge is intentionally harnessed to provide a higher voltage output.