Moving AC energy about. The transformer and its losses, power transmission over long lines, and the oscillations of charge in an LC circuit compared with a spring and a mass.
3 lessons, about 2 h5 simulations11 problems9 practice questionsPython in every lesson
Created by StemPy LabA transformer changes an AC voltage with two coils on one iron core. For an ideal one, . A real transformer loses some power as heat in its windings and in its core.
A line wastes the power as heat. The current is , so the loss is . A transformer raises the voltage for the journey, which cuts the current and the loss.
A charged capacitor joined to a coil makes the charge swing to and fro. The energy moves between the electric field of the capacitor and the magnetic field of the coil. The angular frequency is , in step with a spring and a mass.
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