Electrical Circuits Homework Help?

Question

Hi, i need help with my homework, i did problems 1,2,5 out of the 5, if someone could check my solutions of the problems i already did. 3 &4 i don't know how to solve them if someone could help me there to please. Help is appreciated.

http://i64.photobucket.com/albums/h182/xt3rmin8/CMPE2320.jpg?t=1220323352

http://i64.photobucket.com/albums/h182/xt3rmin8/AnswersCMPE2320.jpg?t=1220323351

Answer 1

I think you have something wrong with the first question, since P=IV

and P=dw/dt, W is given by 500MJ, and the time is 1 week so you should calculate the number of seconds in one week then differentiate the energy in order to find the power and then find the current using the formula: I=P/V.

2. Seems right.

3. Just differentiate the charge (Q) with respect to time, since I= dQ/dt.

4. I= q/t. V= W/q.

P=w/t=V.I.

a) Q= I*t= 1500 mAH.

b) W= V*Q= 1.5*1.5= 2.25 Jouls.

5. Correct answer.

Hope I helped.

Good luck..,