I know this'll seem really obvious to most of you, but I've never studied 'inductance' so have no idea where to even start
'The current in a coil changes from 5A to 2A in 0.05 seconds and induces a voltage of 30V in the coil, the inductance of the coil is?
(I don't even know what H is )
- Thread Starter
- 19-07-2009 19:28
- 19-07-2009 21:08
EMF = inductance x rate of change of current
dI/dt = 3/0.05 = 60
so L = 30 / 60 = 0.5H
- 21-06-2012 00:18
I've almost passed my level 2 c&g tech cert now, but i'm trying to get ahead of the game, if i remember correctly H is (Henry) which is a measure of the inductance of a coil.
I just got this question on a Mock exam and i worked it out like this:
Inductance (L) =
Current change, in this instance (5A-2A) / Rate of change in seconds (0.05s)
3A/0.05s = 60
30v/ 60 = 0.5 Henry