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Question:

What is the potential difference across a 12mH inductor?

If the current through the inductor drops from 110mA to 50mA in 13useconds? u is micro I think?Any ideas?Thanks

Answer:

V L * (di / dt) L 12mH 0.012 H di Δi i {final} - i {initial} di 50mA -110mA di -60mA -0.060 A dt Δt t {final} - t {initial} dt 13 microseconds -0 seconds dt 13 microseconds (μs) dt 13 E-6 seconds (s) V L * (di / dt) V 0.012 H * (-0.060 A / 13 E-6 s) V 0.012 H * (-4,615.3846 A/s) V -55.3846 Volts
The back emf generated by the collapsing magnetic field is given by . ? (-) L.di/dt L self inductance (H) di/dt rate of change of current (A/s) di/dt (110-50)mA / 13μs 60^-3A / 13^-6s 4.62^3 A/s ? (-) 12.0^-3H x 4.62^3A/s . . ?? (-) 55.40 V (- sign indicating a back emf)

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