Series RL circuit

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manaxmizery

Joined Nov 7, 2012
7
upload_2015-10-3_0-47-8.png


For this question , I have used the methods as shown in the picture below :




And for the second question :

upload_2015-10-3_0-57-45.png

I have used the following working :

upload_2015-10-3_1-5-59.png
upload_2015-10-3_1-6-24.png


Can anyone help me check and give me feed back on whether I have done the correct steps and assumptions ? Thanks in advance.

Regards,
Steve
 

shteii01

Joined Feb 19, 2010
4,644
t=2.5 seconds is wrong.

Your limits of integration is from 0 to 2.5 seconds. But within those limits you have two distinct segments. First segment is where v(t)=10 volts, this segment is from 0 to 2 seconds. Second segment is where v(t)=0 volts, this segment is from 2 to 2.5 seconds.

Since integral of zero is zero, you really only have the integral from 0 to 2 seconds plus 1 A.


And, of course, you integral at 4 seconds is also wrong.
 
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