Question

how is thermoelectric emf generated?

Answer 1

hermoelectric energy is electricity produced by difference in temperature. It is based on a phenomenon called the Seeback effect. When one side of a conductor or semiconductor is heated while the other side remains cool, an electric current flows through it. The amount of electric current depends on the temperature difference between the hot and cold sides.

Answer 2

Thermoelectric EMF's can be generated anywhere there are different metals and different temperatures. This includes, but it not limited to, relays. In PXI modules that dissipate power (as most do!) the cooling system results in most PCB's having a temperature profile, so the generation of thermoelectric voltages is almost inevitable. Depending on the design the voltages can be measured to be anywhere form just a few µV to 100's of µV, particularly if many relays are required in the design.

Answer 3

when there is a junction (connection to two dissimilar metal) and one end is heated then the electron in the heated metal gets kinetic energy, they start moving, but where they will go?, then we connect the hot junction to cold junction by wire, then with the help of wire they give there kinetic energy to cold junction, and energy carriers are electron, so we call flow of electron as current, and according to ohm's law, Potential and current are husband and wife, they can't leave without eachother, so current is there, potential is where.

Answer 4

@aditya and @ajay.... thanx buddies for trying to help me out bt then i still don't get the ans i am probably searching for.. i have read about seebeck and peltier effect.. but i don't understand partially the logic behind them..
@ajay- potential and current being husband and wife sounds too funny dude.. jst for your info current may no exist even when there is pd.. so do u call it divorce?? LOL..

Answer 5

check out halliday n rescnik ...its a good book...