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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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