1. The problem statement, all variables and given/known data Hello, the question is number 35 in this picture here: http://uploads.im/uEWAf.jpg It states, ''A suitable fuse rating for the mains supply has current rating - (A)10A (B)15A (C)30A (D)60A 2. Relevant equations V = IR P = IV P = I^2 R P = V^2/R 3. The attempt at a solution I tried using all formulas above, but I only got the answer for questions 32 and 33 which are in the picture, I'm not sure how to find the current rating of the fuse, but the answer in my book is C which is 30A. Am I missing something here?