- #1
BomboshMan
- 19
- 0
Hi,
Two questions I'm finding it hard to get my head around with inductors...
Say we have an increasing current, this is going to cause an increase in flux in one direction, which will induce an emf to drive a current which produces a magnetic field to oppose the change in flux. Than doing the calculation to find induced emf,
ε = |[itex]\frac{d[itex]\Phi[/itex]}{dt}[/itex]| so my first question is, is [itex]\Phi[/itex] the magnetic flux just from the inductor current, or is it the flux from the net magnetic field, including the induced one?
Then my book says that the potential difference of the inductor is minus the induced emf. I get the minus, but wouldn't the inductor have an 'original' potential difference, as in shouldn't the overall potential difference of the inductor be the 'original' pd plus the induced emf?
Hope that made sense!
Thanks,
Matt
Two questions I'm finding it hard to get my head around with inductors...
Say we have an increasing current, this is going to cause an increase in flux in one direction, which will induce an emf to drive a current which produces a magnetic field to oppose the change in flux. Than doing the calculation to find induced emf,
ε = |[itex]\frac{d[itex]\Phi[/itex]}{dt}[/itex]| so my first question is, is [itex]\Phi[/itex] the magnetic flux just from the inductor current, or is it the flux from the net magnetic field, including the induced one?
Then my book says that the potential difference of the inductor is minus the induced emf. I get the minus, but wouldn't the inductor have an 'original' potential difference, as in shouldn't the overall potential difference of the inductor be the 'original' pd plus the induced emf?
Hope that made sense!
Thanks,
Matt