+ - Where did the energy in the inductor go?
- How much power was fed to the resistor?
- Integrate to get total energy dissipated
- Powering up an inductor:
- Similar calculation
- An inductor with inductance 4.0 mH is discharging through a resistor of resistance R. If, in 1.2 ms, it dissipates half its energy, what is R?
- For inductors in series, the inductors have the same current
- Their EMF’s add
- For inductors in parallel, the inductors have the same EMF but different currents
- Parallel and Series - Formulas
- Materials Inside Inductors
- For capacitors, we gained significantly by putting materials inside
- Can we gain any benefit by putting something in inductors?
- It gives you something to wrap around
- Can materials increase the inductance?
- Most materials have negligible magnetic properties
- A few materials, like iron are ferromagnetic
- They can enhance inductance enormously
- Many inductors (and similar devices, like transformers) have iron cores
- Symbol for iron core inductor:
- We won’t make this distinction
- Consider two solenoids sharing the same volume
- What happens as you close the switch?
- Current flows in one coil
- But Lenz’s Law wants mag. flux constant
- Compensating current flows in other coil
- Allows you to transfer power without circuits being actually connected
- It works even better if source is AC from generator
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