The Seebeck effect is fairly linear; that is, the voltage produced by a heated junction of two wires is directly proportional to the temperature. This means that the temperature of the metal wire junction can be determined by measuring the voltage produced.
Causes[edit] Lightheadedness can be simply (and most commonly) an indication of a temporary shortage of blood or oxygen to the brain due to a drop in blood pressure, rapid dehydration from vomiting, diarrhea, or fever, or from playing a wind instrument.
Take a break from whatever activity youâre doing. No matter the cause of your lightheadedness, stop what you're doing and rest for a couple of minutes. This will help your circulation and brain adjust. 1  Continuing to move or moving suddenly can make your lightheadedness worse, and may cause you to lose your balance.n fact, you can usually figure out the cause of lightheadedness based on the sensations you are feeling. Knowing the cause will also give you a clue of how best to get rid of your lightheadedness.