Navy SAGA Test 1 Practice

In electronics, which component stores energy in a magnetic field?

Capacitor Resistor Inductor Diode

Correct Answer:

Inductor

Explanation:

Storing energy in a magnetic field is a property of the inductor. When current flows through a coil, a magnetic field builds up around it and energy is stored in that field, proportional to 1/2 times the inductance times the current squared (E = 1/2 L I^2). This magnetic energy can be released back into the circuit when the current changes. By contrast, a capacitor stores energy in an electric field between its plates (E = 1/2 C V^2); a resistor converts energy into heat and does not store it; a diode is a nonlinear device that controls current flow and also does not store energy.

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