Finding Initial Current and Natural Response in an RL Circuit

AI Thread Summary
The discussion revolves around solving an RL circuit problem, specifically finding the initial current through an inductor and understanding the role of a dependent source. Participants clarify that the diamond-shaped component is identified as a current controlled voltage source. The original poster (OP) indicates they have resolved their issue, noting that at t=0-, the inductor acts as a short circuit, allowing the initial current to be determined through a resistor. For t >= 0, the natural response of the inductor's current requires calculating the equivalent resistance using Thevenin's theorem. The conversation emphasizes the importance of showing work and understanding circuit analysis principles.
csmix
Messages
2
Reaction score
0
Can anyone please help me slove this example circuit i found.
im having a hard time finding the initial current through the inductor and duno how to deal with the dependent source and inductor after the switch is opened.
 

Attachments

  • RLnatural.JPG
    RLnatural.JPG
    14.4 KB · Views: 936
Last edited:
Engineering news on Phys.org
What's the diamond shaped thing? Is that a current controlled voltage source or a current controlled current source?

What equations have you been able to set up so far? Is this a homework problem?
 
berkeman said:
What's the diamond shaped thing? Is that a current controlled voltage source or a current controlled current source?

What equations have you been able to set up so far? Is this a homework problem?

Looks like a current controlled voltage source.

To the OP -- you're going to have to show some work, like berkeman said.
 
thanks for feed back but i have figured it out. If anyone else needs help with this circuit i'll get u guys started. to find initial current at t=0- the inductor is a short circuit so Io is just the current through the 4.5Ohm resistor.

After the switch is closed to find iL(t) for t >=0 you will need to use the natural response equation for the current of an inductor which means u will need to find Req for tao. to find Req u need to thevenize the circuit by creating an open circuit at the inductor and finding Voc=Vth then the R in the standard form would be Vth/Itotal.
 

Thread 'How might electronics be different if AC voltage was 72V at 45 Hz?'

Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
View full post »

Thread 'What happens if shielded cable has a short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'Why does the amperage go real high if there is a low voltage short?'

I used to be an HVAC technician. One time I had a service call in which there was no power to the thermostat. The thermostat did not have power because the fuse in the air handler was blown. The fuse in the air handler was blown because there was a low voltage short. The rubber coating on one of the thermostat wires was chewed off by a rodent. The exposed metal in the thermostat wire was touching the metal cabinet of the air handler. This was a low voltage short. This low voltage...
View full post »

Similar threads

Where does the current go in this RL circuit?
Replies
8
Views
2K
High-energy LC oscillatory discharge: what kind of switch?
Replies
19
Views
1K
How does an inductor determine the applied voltage in an RL circuit?
Replies
12
Views
2K
Analyzing pushbutton switch ADC circuit edge cases
Replies
4
Views
999
Need help in understanding these circuits
Replies
2
Views
2K
Why Do Circuit A and Circuit B Show Different Current and Voltage Behaviors?
Replies
2
Views
3K
How can I control the current in an RL circuit using state space modeling?
Replies
2
Views
6K
Old City & Guilds Current Limitation Question
Replies
2
Views
1K
Parallel RL Circuits: Uses & Impedance Matching
Replies
3
Views
2K
High-Power Switching using MOSFETs
Replies
14
Views
4K

Hot Threads

Recent Insights

Back
Top