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Inductors and Stored Energy

Energy stored in magnetic fields

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The energy stored in the magnetic field of an inductor can be expressed as

W = 1/2 L I2                        (1)

where

W = energy stored (joules, J)

L = inductance (henrys, H)

I = current (amps, A)

Example - Energy Stored in an Inductor

The energy stored in an inductor with inductance 10 H with current 5 A can be calculated as

W = 1/2 (10 H) (5 A)2

    = 125 J

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