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2. Quantum heat engines and refrigerators - Wikipedia

   en.wikipedia.org/wiki/Quantum_heat_engines_and...

   Externally driven two-level, [24] three level [25] four-level [26] [27] and coupled harmonic oscillators [28] have been studied. The periodic driving splits the energy level structure of the working medium. This splitting allows the two level engine to couple selectively to the hot and cold baths and produce power.

3. The best Cyber Monday appliance deals at Home Depot ... - AOL

   www.aol.com/lifestyle/the-best-cyber-monday...

   Save up to 50% off major appliances including deep freezers, ranges and cooktops at Best Buy through Dec. 2. We're eyeing this 4-door Samsung refrigerator and ice maker combo. That's a whopping ...

4. Power rating - Wikipedia

   en.wikipedia.org/wiki/Power_rating

   For AC-operated devices (e.g. coaxial cable, loudspeakers), there may even be two power ratings, a maximum (peak) power rating and an average power rating. [5] [6] For such devices, the peak power rating usually specifies the low frequency or pulse energy, while the average power rating limits high-frequency operation. [5]

5. Electrical efficiency - Wikipedia

   en.wikipedia.org/wiki/Electrical_efficiency

   A large power transformer used in the electrical grid may have efficiency of more than 99%. Early 19th century transformers were much less efficient, wasting up to a third of the energy passing through them. [citation needed] A steam power plant used to generate electricity may have 30-40% efficiency. [citation needed]

6. All of the best Black Friday deals: Amazon, Walmart, Wayfair ...

   www.aol.com/lifestyle/all-of-the-best-black...

   Updated: Black Friday's best weekend deals are here on Apple AirPods and iPads, Samsung TVs, Bissell vacuums, KitchenAid and Ninja small appliances, gifts for men, women and kids — and more.

7. AOL reviewed: The Wonder Oven is my go-to kitchen appliance ...

   www.aol.com/lifestyle/our-place-wonder-oven...

   One of the reasons why air fryers have exploded in popularity within the past decade is because they get meals on the table fast. Compared to the time spent waiting for a full-sized oven to ...