Circuits with current can store magnetic energy {inductance}|. Circuit devices {inductor} can store magnetic energy. Inductors are wire coils, so current makes strong magnetic field down coil middle. Soft iron bar can be in middle.
energy
Energy stored depends on current change compared to voltage. Inductance L is voltage V divided by current change dI with time change dt: L = V / (dI/dt). V = L * dI/dt. Magnetic-field energy builds as current flows. Magnetic-field energy tends to push current to stop. Current and voltage are out of phase. Magnetic-field energy E equals half inductance L times current I squared: E = 0.5 * L * I^2.
factors
Inductance increases as coil area increases, current-change frequency decreases, space magnetic-permeability increases, current decreases, voltage increases, coil-turn number decreases, and inductor length increases.
mutual inductance
Two coils with current have mutual inductance.
Physical Sciences>Physics>Electromagnetism>Circuit>Impedance
5-Physics-Electromagnetism-Circuit-Impedance
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Date Modified: 2022.0224