Elementary Lessons in Electricity And Magnetism
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THERMO-ELECTRIC ITY.
LESSON XXXIV. Thenno-Electric Currents.
379. In 1822 Seebeck discovered that a current may be produced in a closed circuit by heating a point of contact of two dissimilar metals. Thus, if a piece of bismuth and a piece of antimony be soldered together, and their free ends be connected with a short -coil galvanometer, it is found that if the junction be warmed to a temperature higher than that of the rest of the circuit, a current flows whose direction across the heated poin...t is from bismuth to antimony, the strength of the current being proportional to the excess of temperature. If the junction is cooled below the temperature of the rest of the circuit a current in the opposite direction is generated. The electromotive -force thus set up will maintain a constant current so long as the excess of temperature of the heated point is kept up, heat being all the while absorbed in order to maintain the energy of the current. Such currents are called Thermo-electric currents, and the electromotive -force producing them is known as Thermo-electromotive-force.
What to read after Elementary Lessons in Electricity And Magnetism?
You can find similar books in the "Read Also" column, or choose other free books by Silvanus Phillips Thompson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
THERMO-ELECTRIC ITY.
LESSON XXXIV. Thenno-Electric Currents.
379. In 1822 Seebeck discovered that a current may be produced in a closed circuit by heating a point of contact of two dissimilar metals. Thus, if a piece of bismuth and a piece of antimony be soldered together, and their free ends be connected with a short -coil galvanometer, it is found that if the junction be warmed to a temperature higher than that of the rest of the circuit, a current flows whose direction across the heated poin...t is from bismuth to antimony, the strength of the current being proportional to the excess of temperature. If the junction is cooled below the temperature of the rest of the circuit a current in the opposite direction is generated. The electromotive -force thus set up will maintain a constant current so long as the excess of temperature of the heated point is kept up, heat being all the while absorbed in order to maintain the energy of the current. Such currents are called Thermo-electric currents, and the electromotive -force producing them is known as Thermo-electromotive-force.
What to read after Elementary Lessons in Electricity And Magnetism?
You can find similar books in the "Read Also" column, or choose other free books by Silvanus Phillips Thompson to read onlineMoreLess
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