In the figure R1 = 7.78 0, R2 = 23.3 0, and the ideal battery has emfe = 11.3 V. (a) What is the magnitude of current i,? (b) How much energy is dissipated by all four resistors in 2.40 min? (a) Number Units A (b) Number ! Units J In the figure the current in resistance 6 is is = 1.48 A and the resistances are R1 = R2 = R3 = 2.04 0, R4 = 14.102, Rs = 8.61 02, and R6 = 3.47 0. What is the emf of the ideal battery 2 - Number Units You are given a number of 15 Q resistors, each capable of dissipating only 2.5 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in parallel to make a 15 Q resistance that is capable of dissipating at least 10.7 W? Number i Units No units