Title: 2nd Law: HE, HP's and Refrigerators

Fill in the missing words

Q: Heat engines are devices that convert [...] into [...].

[...] are devices that are used to maintain a space at a desired high-temperature environment. They require some [...] work to operate.
A: heat; work; Heat pumps; input

2nd Law: Heat Engines, Heat Pumps, and Refrigerators

- High-Temp Sink
- Heat Pump
- Low-temp Source
- QH
- WIN
- QL
- High-Temp Source
- HE
- Low-Temp Sink
- QIN
- WOUT
- QOUT
Q: 1
A: High-Temp Sink
Q: 2
A: Heat Pump
Q: 3
A: Low-temp Source
Q: 4
A: QH
Q: 5
A: WIN
Q: 6
A: QL
Q: 7
A: High-Temp Source
Q: 8
A: HE
Q: 9
A: Low-Temp Sink
Q: 10
A: QIN
Q: 11
A: WOUT
Q: 12
A: QOUT

Here are two schematics: 1 for a heat engine and the other for a heat pump.

Drop the text boxes in the correct spots.

Scroll down to check your answer.

Q: It is possible for a heat engine to take heat from a high-temperature source and convert 100% of the energy to work.
A: false

Q: For energy to be transferred from a low-temperature environment to a high-temperature temperature environment, a device with input work is required.
A: true

Q: A startup boasts of its new invention: an ultra-high efficiency heat pump with 100% efficiency. Would you invest in this start-up?

Choose the best statement.
- No I wouldn't invest, this start-up's invention is impossible - it violates the Kelvin-Planck statement for the second-law of thermodynamics. (correct)
- No I wouldn't invest, this start-up's invention is impossible - it violates the first law of thermodynamics.
- I would invest in the start-up - it takes advantage of the Kelvin-Planck statement for the second-law of thermodynamics.