230. assignment (heat)

1. A heat engine uses resistors to boil water as part of its operation. There are 3 resistors with resistances 25 ohms, 10 ohms, and 15 ohms connected in series. The resistors are connected to a 240 V power source.

a. (2) What is the equivalent resistance of the three resistors?

b. (2) How much electric power is dissipated in the resistors (all together)?

d. (3) The engine extracts 1200 kJ of heat from the steam each cycle, and does 345 kJ of work. What is the engines efficiency?

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