Hello, this is my first time posting on this forum and I have seeked help on this forum before on previous assignments for my physics class. There are four problems that I do not understand clearly or do not understand how the image is portrayed in a blueprint format Problem 1 1. The problem statement, all variables and given/known data http://img291.imageshack.us/img291/4382/problem39.jpg [Broken] Find i 2. Relevant equations Kirchhoff's rules 3. The attempt at a solution I can find 2 loops with Kirchhoff's rules, but it is not enough to find i. 6 - 3.5i2 - 2.2i = 0; 6 - 3.5i1 - 2.2i = 0; I understand I need to find a loop without i so I can eliminate i2 or i1 from one of the equations, but I do not understand the concept of two batteries facing each other. I tried using i2=i3+i or i = i2 - i3 and i just comes out to 0 Problem 2 1. The problem statement, all variables and given/known data http://img175.imageshack.us/i/problem30.jpg/" [Broken] If the emf of the battery is 15 V, and each resistance is 2, what is the power consumed by bulb B? Bulb D is then removed from its socket.How does the brightness of bulb A change? How does the brightness of bulb B change when bulb D is removed from its socket? 2. Relevant equations not sure? 3. The attempt at a solution The picture itself is confusing to me. I do not get how to put the light bulb picture into a blueprint format. Any information on simplifying this image would be amazing. Problem 3 1. The problem statement, all variables and given/known data http://img687.imageshack.us/i/problem25.jpg/" [Broken] Find the equivalent resistance R between points A and B of the resistor network. 2. Relevant equations series circuit resistance = R1+R2+R3.... Parallel circuit resistance= [(1/R1) + (1/R2) + (1/R3)]-1 3. The attempt at a solution (1/(41+21+26)+1/33)-1= 264/11 [(1/(21+ 264/11)) + 1/36]-1 = 1980/59 = 33.55932203 Solved Final answer = 20 Problem 4 1. The problem statement, all variables and given/known data http://img85.imageshack.us/i/problem22.jpg/" [Broken] R = [(675-486)/5.8] - .36 - .16 - 1.15= 30.9162069 Find the potential difference Vxy = Vx − Vy between points X and Y How much energy UE is dissipated by the 1.15 in 55 s ? 2. Relevant equations Vxy = Vx − Vy P=IV V=IR 3. The attempt at a solution Once again the negative sides facing each other completely throw me off and I have no Idea what to do.