# Peltier-effect Sentence Examples

The order of the metals in respect of the

**Peltier effect**was found to be the same as the thermoelectric series.But on account of the difficulty of the measurements involved, the verification of the accurate relation between the

**Peltier effect**and thermoelectric power was left to more recent times.Clausius (1853) that the

**Peltier effect**varied directly as the absolute temperature, and that the E.M.F.Consider an elementary couple of two metals A and B for which s has the values s and s" respectively, with junctions at the temperature T and T+dT (absolute), at which the coefficients of the

**Peltier effect**are P and P+dP. Equating the quantity of heat absorbed to the quantity of electrical energy generated, we have by the first law of thermodynamics the relation dE/dT =dP/dT+(s' - s").The

**Peltier effect**was only a small fraction of the total effect, but could be separated from the Joule effect owing to the reversal of the current.According to this formula, the

**Peltier effect**is a linear function of the temperature.The flow of the current will produce a fall of potential ER'/R in the lead from cold to hot, and ER"/R in the iron from hot to cold, but the potential difference due to the

**Peltier effect**at either junction will not be affected.The

**Peltier effect**and the thermo-E.M.F., on the other hand, do not depend on the state of the surfaces, but only on the state of the substance.Although it is possible that differences of potential larger than the

**Peltier effect**might exist between two metals in contact on open circuit, it is certain that the only effective E.M.F.In this case, however, in order to account for the phenomenon of the

**Peltier effect**at the junctions, it is necessary to suppose that there is a real convection of heat by an electric current, and that the coefficient P or pT is the difference of the quantities of heat carried by unit quantity of electricity in the two metals.AdvertisementIf, therefore, we are prepared to admit that an electric current can carry heat, the existence of the

**Peltier effect**is no proof that a corresponding E.M.F.The range of Steele's observations was too small to show any certain deviation from the formula, but he notes capricious changes attributed to change of condition of the proved to be proportional to the square of the current, the

**Peltier effect**is reversible with the current, and being directly proportional to the first power of the current, changes sign when the current is reversed.Semi conductor thermoelectric device which works on the

**Peltier effect**.Thermoelectric cooling is also known as the

**Peltier effect**.Most tabletop chillers that utilize the

**Peltier effect**both heat and cool.Advertisement