1. The problem statement, all variables and given/known data First post here... Sorry it has to be a question. I'm currently studying electrical engineering at university. Anyway, I've hit a couple of these mesh type circuits in my workbook and have no idea how to tackle them? The question asks to solve using Thevenin's Theorem, but they look completely different to our worked examples and I'm at a loss as to where to begin, let alone solve the questions! 2. Relevant equations Here is one of the questions - Given: E1 = 200 V; R1 = 15 Ω; R2 = 20 Ω; R3 = 20 Ω; R4 = 12 Ω and RL = 27 Ω (a) Use Thevinin’s theorem to determine the value of current I. (b) Check you answer using Δ-to-Y transformation and Kirchhoff’s laws. 3. The attempt at a solution Like I said, unfortunately I don't know where to begin with this Thanks in advance to anyone who can help me out here.