Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

Post History

60%
+1 −0
Q&A Current and voltage of inductor

After the switch is closed : The general formula for finding the current through the inductor is this: where If is the current through the inductor after infinite time,Io is the current of th...

posted 3y ago by MissMulan‭  ·  edited 3y ago by MissMulan‭

Answer
#3: Post edited by user avatar MissMulan‭ · 2021-09-03T14:06:40Z (over 3 years ago)
  • After the switch is closed :
  • ![hi](https://electrical.codidact.com/uploads/CKwPvMefd7M9yAg94vGZypHm)
  • The general formula for finding the current through the inductor is this:
  • ![hi](https://electrical.codidact.com/uploads/Qk6zZfyGQoTekDqw7Jm9WEHA)
  • where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed.
  • Because inductors resist any change in current:
  • ![hi](https://electrical.codidact.com/uploads/CtwGbysnFxGjvhJCxTfigWTo)
  • This tells us that at the moment the switch is closed the current through the inductor will be equal to the current through it before the switch is closed which is 0.
  • ![hi](https://electrical.codidact.com/uploads/wFwihpAHyou3t3FZgQNgVWwK)
  • As t tends to infinity the inductor will act as an open circuit which means that by current division the current will be 0.03A.
  • the R in the exponent is the total resistance seen by the inductor which is:
  • ![hi](https://electrical.codidact.com/uploads/v1jjb2FzSCi5L2BpHMEQMVGq)
  • so the current equation will be:
  • ![hi](https://electrical.codidact.com/uploads/gUKSy5YXoQjYjFXrgPPcP1Yd)
  • and the voltage between the ends of the inductor will be:
  • ![hi](https://electrical.codidact.com/uploads/vQUhx876aQfeEtmGuheDXRaM)
  • After the switch is closed :
  • ![hi](https://electrical.codidact.com/uploads/CKwPvMefd7M9yAg94vGZypHm)
  • The general formula for finding the current through the inductor is this:
  • ![hi](https://electrical.codidact.com/uploads/Qk6zZfyGQoTekDqw7Jm9WEHA)
  • where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed.
  • Because inductors resist any change in current:
  • ![hi](https://electrical.codidact.com/uploads/CtwGbysnFxGjvhJCxTfigWTo)
  • This tells us that at the moment the switch is closed the current through the inductor will be equal to the current through it before the switch is closed which is 0.
  • ![hi](https://electrical.codidact.com/uploads/wFwihpAHyou3t3FZgQNgVWwK)
  • As t tends to infinity the inductor will act as a short circuit which means that by current division the current will be 0.03A.
  • the R in the exponent is the total resistance seen by the inductor which is:
  • ![hi](https://electrical.codidact.com/uploads/v1jjb2FzSCi5L2BpHMEQMVGq)
  • so the current through the inductor equation will be:
  • ![hi](https://electrical.codidact.com/uploads/gUKSy5YXoQjYjFXrgPPcP1Yd)
  • and the voltage of the inductor will be:
  • ![hi](https://electrical.codidact.com/uploads/vQUhx876aQfeEtmGuheDXRaM)
#2: Post edited by user avatar MissMulan‭ · 2021-09-02T09:54:53Z (over 3 years ago)
  • After the switch is closed :
  • ![hi](https://electrical.codidact.com/uploads/CKwPvMefd7M9yAg94vGZypHm)
  • The general formula for finding the current through the inductor is this:
  • ![hi](https://electrical.codidact.com/uploads/Qk6zZfyGQoTekDqw7Jm9WEHA)
  • where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed.
  • Because inductors resist any change in current:
  • ![hi](https://electrical.codidact.com/uploads/CtwGbysnFxGjvhJCxTfigWTo)
  • This tells us that at the moment the switch is closed the current through the inductor will be equal to the current through it before the switch is closed which is 0.
  • ![hi](https://electrical.codidact.com/uploads/wFwihpAHyou3t3FZgQNgVWwK)
  • As t tends to infinity the inductor will act as an open circuit which means that by current division the current will be 0.03A.
  • the R in the exponent is the total resistance seen by the inductor which is:
  • ![hi](https://electrical.codidact.com/uploads/v1jjb2FzSCi5L2BpHMEQMVGq)
  • so the current equation will be:
  • ![hi](https://electrical.codidact.com/uploads/gUKSy5YXoQjYjFXrgPPcP1Yd)
  • and the voltage of the inductor will be:
  • ![hi](https://electrical.codidact.com/uploads/vQUhx876aQfeEtmGuheDXRaM)
  • After the switch is closed :
  • ![hi](https://electrical.codidact.com/uploads/CKwPvMefd7M9yAg94vGZypHm)
  • The general formula for finding the current through the inductor is this:
  • ![hi](https://electrical.codidact.com/uploads/Qk6zZfyGQoTekDqw7Jm9WEHA)
  • where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed.
  • Because inductors resist any change in current:
  • ![hi](https://electrical.codidact.com/uploads/CtwGbysnFxGjvhJCxTfigWTo)
  • This tells us that at the moment the switch is closed the current through the inductor will be equal to the current through it before the switch is closed which is 0.
  • ![hi](https://electrical.codidact.com/uploads/wFwihpAHyou3t3FZgQNgVWwK)
  • As t tends to infinity the inductor will act as an open circuit which means that by current division the current will be 0.03A.
  • the R in the exponent is the total resistance seen by the inductor which is:
  • ![hi](https://electrical.codidact.com/uploads/v1jjb2FzSCi5L2BpHMEQMVGq)
  • so the current equation will be:
  • ![hi](https://electrical.codidact.com/uploads/gUKSy5YXoQjYjFXrgPPcP1Yd)
  • and the voltage between the ends of the inductor will be:
  • ![hi](https://electrical.codidact.com/uploads/vQUhx876aQfeEtmGuheDXRaM)
#1: Initial revision by user avatar MissMulan‭ · 2021-09-02T09:49:32Z (over 3 years ago)
After the switch is closed :

![hi](https://electrical.codidact.com/uploads/CKwPvMefd7M9yAg94vGZypHm)

The general formula for finding the current through the inductor is this:

![hi](https://electrical.codidact.com/uploads/Qk6zZfyGQoTekDqw7Jm9WEHA)

where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed.

Because inductors resist any change in current:

![hi](https://electrical.codidact.com/uploads/CtwGbysnFxGjvhJCxTfigWTo)

This tells us that at the moment the switch is closed the current through the inductor will be equal to the current through it before the switch is closed which is 0.

![hi](https://electrical.codidact.com/uploads/wFwihpAHyou3t3FZgQNgVWwK)

As t tends to infinity the inductor will act as an open circuit which means that by current division the current will be 0.03A.

the R in the exponent is the total resistance seen by the inductor which is:

![hi](https://electrical.codidact.com/uploads/v1jjb2FzSCi5L2BpHMEQMVGq)

so the current equation will be:

![hi](https://electrical.codidact.com/uploads/gUKSy5YXoQjYjFXrgPPcP1Yd)

and the voltage of the inductor will be:

![hi](https://electrical.codidact.com/uploads/vQUhx876aQfeEtmGuheDXRaM)