# Basic RL and RC circuits

Discussion in 'Homework Help' started by Johnowi, Dec 23, 2014.

1. ### Johnowi Thread Starter New Member

Dec 23, 2014
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Really struggling to make sense of these from examples from my textbook, would be a massive help if someone could give a solution and explanation of how to solve these two problems.

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2. ### MikeML AAC Fanatic!

Oct 2, 2009
5,451
1,071
To get you started on Q1:

1. What is the current through the inductor just before the switch opens?
2. What is the current through the inductor just after the switch opens?
3. What is the current through the inductor a long time after the switch opens?
4. Where does the current flow while getting from 2. to 3.?
5. What is the shape of the inductor current vs. time while getting from 2. to 3.

3. ### WBahn Moderator

Mar 31, 2012
20,251
5,758
To get you started in Q2:

1) What is the relationship between current and voltage for a resistor?
2) What is the relationship between current and voltage for a capacitor?
3) How do these relate to the voltage and current given in the problem?
4) What is the relationship between current and/or voltage and energy stored in a capacitor?
5) What condition are you looking for that will indicate 50% of the energy in the capacitor has been expended?

Now it's time for YOU to show YOUR attempts to solve YOUR homework problems.

4. ### Cliff Lian New Member

Dec 25, 2014
2
0
Hellow~ I am a Electrical Engineering too
This is my answer for Q1

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5. ### WBahn Moderator

Mar 31, 2012
20,251
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Please, this is the Homework HELP forum, not the Homework Done For You forum. The OP is expected to show some effort to work their own homework and then we are expected to help point out mistakes they are making and to help guide them toward a solution while letting the OP learn from their continued efforts.