7. An inductor of negligible resistance and an inductance of 0.2 H isconnected in series with a 330...

Question

7. An inductor of negligible resistance and an inductance of 0.2 H isconnected in series with a 330 O resistor to a 12V d.c. supply.Determine:(a) the time constant of the circuit(b) the voltage drop across the inductor after two time constants(c) the voltage drop across the resistor after three time constants(d) the resistance of a 0.2 H coil used to replace the inductor if thecircuit’s time constant falls to 0.55 ms.

Robert · Accepted Answer

RL Circuit 
 
0
.2
 H
12V
330 ohm
 
 
(a) Time constant of the circuit, 
L
R
   =0.61ms 
(b) Voltage across inductor, 
t
LV Ve


   
  For 2t   , 2 212LV Ve e
   =1.62V 
(c) Voltage across resistor, (1 )
t
RV V e


    
For 3t  , 3 3(1 ) 12(1 ) 11.

7. An inductor of negligible resistance and an inductance of 0.2 H isconnected in series with a 330 O resistor to a 12V d.c. supply.Determine:(a) the time constant of the circuit(b) the voltage drop...

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