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Physics
Classical Physics
Mechanics
Understanding energy conservation in a solenoid
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[QUOTE="Baluncore, post: 6351345, member: 447632"] During the first period you generated a positive voltage that caused a positive current to begin flowing in the coil, to create the magnetic field. Positive current multiplied by positive voltage is real power input. During the second period you dropped the voltage to zero and maintained the same current and field. Zero voltage multiplied by any current is zero power. During the third period you present a negative voltage to the coil while the current and the field fall to zero. Positive current multiplied by negative voltage is real power recovery. But you don't get it all back because there is an EM wave, continuing to radiate out to infinity. The more magnetic field you generate, the more energy is radiated away into space. [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
Understanding energy conservation in a solenoid
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