The A. has given me something: a cup warmer. Not any, but - according to the receiver completely geekgemäß - one with USB power. There are now no more, that does not exist with a USB port. 've Been reading the latest of the annual December Pearl Catalogue of the opinion that USB is only secondarily a standard for data transmission. Primarily, however USB is used to supply power to gadgets. Not much power that gives the specification is not applicable, probably not enough for a fondue set or Grill . But at least a cup and its contents should you can keep warm with USB power supplied, is not it? An attempt to prove it. As the temperature developed by leciht heated water in a heated tank?
I have the following thought experiment setup: Two coffee cups are filled with 29 ° warm water. A cup is placed on a preheated cup warmer USB. At intervals of 10 minutes is determined by the analog tea thermometer the temperature of the contents of both cups. The use of two cups, we see not only the Wärmeffekt the device in absolute terms but also relative to a non-heated cup. The whole does not take place under laboratory conditions, but for an indication the effectiveness it should be sufficient. The room temperature is 22 °. Who asks for the air pressure, can I slide down the hump, I'm much, but not a physicist.
The experiment begins (note the red activity light on the cup warmer):
After about 20 minutes I kill the two measurements un attempt. The results:
| time | cup (warmed) | cup (comparison) |
| clock 18:00 | 29.0 ° | 29.0 ° |
| clock 18:11 | 27.2 ° 26 ° | |
| clock 18:20 | 27.0 ° 25 ° |
Hm
2 ° difference between heated and unheated cup after 20 minutes? Whether this is worth it really? Maybe he prefers a traditional warmer with candle. Or drink the hot drink faster, so it is not only cold.
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