Hello All
I have been given this question by my HNC lecturer and need some help understanding it better. It doesnt help that Im studying a Mechanical HNC rather than Electrical so I thought Id post it up here!
The question says that the growth of an inductive circuit is given by the equation: i(t) = I (1 -e (to power of)-Rt/L)
Where R is the resistance of the circuit in Ohms
L is the inductance in Henrys
i(t) is the current in the circuit at any time t seconds in Amps
I is the final or steady current that flows in the circuit in Amps
t is time in seconds
The ratio of L/R is the time constant of the circuit and is measured in seconds.
The question says that a particular circuit has a time constant of 10 milliseconds and a steady state current of I= 10Amps. The initial Current is zero.
Im then asked to work out:
A) The value of the current flowing 4milliseconds after the circuit is switched on.
B) The time after switch on when the current has grown to 5A
C) The value of the inductance of the circuit
Ive had a go at it but still to no avail. Ive also reffered to a smilar example given in Edwars Hughes book Electrical Technology on Pg118,119 (fourth Edition) but my lack of electrical knowledge is putting a damper on my progress.
Any Help with this would be much appreciated.
All the best
Tommy
I have been given this question by my HNC lecturer and need some help understanding it better. It doesnt help that Im studying a Mechanical HNC rather than Electrical so I thought Id post it up here!
The question says that the growth of an inductive circuit is given by the equation: i(t) = I (1 -e (to power of)-Rt/L)
Where R is the resistance of the circuit in Ohms
L is the inductance in Henrys
i(t) is the current in the circuit at any time t seconds in Amps
I is the final or steady current that flows in the circuit in Amps
t is time in seconds
The ratio of L/R is the time constant of the circuit and is measured in seconds.
The question says that a particular circuit has a time constant of 10 milliseconds and a steady state current of I= 10Amps. The initial Current is zero.
Im then asked to work out:
A) The value of the current flowing 4milliseconds after the circuit is switched on.
B) The time after switch on when the current has grown to 5A
C) The value of the inductance of the circuit
Ive had a go at it but still to no avail. Ive also reffered to a smilar example given in Edwars Hughes book Electrical Technology on Pg118,119 (fourth Edition) but my lack of electrical knowledge is putting a damper on my progress.
Any Help with this would be much appreciated.
All the best
Tommy