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

66%
+2 −0
Q&A Current and voltage in AC circuits without impedance

Since this is homework, I'm not just going to give you the answer. When all else fails, go back to first principles. That's what handy shortcuts, like using impedance, were derived from. In this...

posted 3y ago by Olin Lathrop‭

Answer
#1: Initial revision by user avatar Olin Lathrop‭ · 2021-06-14T13:06:20Z (over 3 years ago)
Since this is homework, I'm not just going to give you the answer.

When all else fails, go back to first principles.  That's what handy shortcuts, like using impedance, were derived from.

In this case, you'll end up with a system of differential equations.  You have already written the equation for the capacitor current as a function of its voltage.  Note that the capacitor and resistor currents are the same.  You should be able to write the equation for the resistor current.

The voltage across the two components are also related, in that their sum must equal the driving voltage.

After you write the various individual equations, you solve the set of equations to get the capacitor voltage as a function of the driving voltage.  Note that this assumes you've already had your differential equations course.