I didn't have time to read all the responses below. There is probably some good comments & discussion.
The answer depends on how you define efficiency. If you define efficiency has the amount of heat dissipated, divided by the electric energy consumed, then all the devices have 100% efficiency, even the motor, as long as it is not connected to some load that is storing energy (such as pumping water or compressing air). If you define efficiency as the amount of heat delivered to your skin, where your body temperature sensors are located, divided by the electric energy consumed, then there can be quite a difference.
I am a practicing engineer and design generators for electric power plants. Efficiency is critical to us (how to improve it, how to measure it). Some interesting facts (perhaps): Most large generators are better than 99% efficient. One tenth of one percent gain in efficiency in a large generator is worth about 4-5 thousand dollars per day, or about 4-5 million dollars over the typical life of a generator. But, a loss in reliability to gain that extra efficiency that results in a repair of more than a couple days wipes out the entire savings.
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Today's Featured Article - Show Coverage: The Old Gold National Antique Tractor Show - by Cindy Ladage. Over the fourth of July weekend, the Illinois State Fairgrounds in Springfield, Illinois, was the site of the Old Gold National Antique Tractor Show. Tractors of all makes and models were displayed and separted into categories by their age. Deere, Oliver and even a Wards and Keck Gonerman were part of the crowd. A sea of red International Harvester's seemed to be the the model with the biggest showing. The crowd was decent for the scorching July heat. The opening day started o
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