[填空题]
A 2200-W oven is hooked to a 2w7 7* omu,-ijmfl +-9t sj, pa gtr(vk7rwza/x40(rw2pgxp.x8wz /bn f)-V source.
(a) What is the resistance of the oven? $\Omega$
(b) How long will it take to bring 120 mL of 15$^{\circ}\,C$ water to 100$^{\circ}\,C$ assuming 75% efficiency? s
(c) How much will this cost at $11 cents/kWh?$ cents
