Why is there an electrical current in a wire/metal if one end is hotter than the other?

Answer 1

This is the thermoelectic effect and is caused by different rate of diffusion of the charge carriers (typically electrons) in the hot and in the cold end. The hot carriers diffuse faster to the cold end than the other way round. This process eventually reaches an equilibrium, with an uneven distribution of the carriers along the conductor. A current of the carriers is flowing in both directions and the net current is zero. The carriers gradient, however, creates a potential difference (a voltage).

Answer 2

merely think of roughly some ammount of water stored in a jar at a top. The jar has a pipeline popping out of it which has a faucet on the top. If tahe faucet is closed then there is no water pass in the process the pipeline. in case you open it slightly water comes out dropwise and the extra you go on openning extra is the pass. Now merely convert right here water = electrons pipeline = conductor faucet = resistance water pass in the process the pipe = modern in the process the conductor Electrons pass from positions of better unfastened electron concentration in direction of decrease electron concentrations. the two positions can purely be seperated if and on condition that the area in betwwen them is seperated by potential of a exceptionally resistive substance. If the resistance decreases then there is pass of electrons from greater to diminish concentrations. This pass is named electric powered modern.

Answer 3

current is nothing but flow of electrons.when one end of a metal is heated then electrons start migrating or flowing to cooler region which constitute electric curent.

Answer 4

Isn't an EMF set up? Energy will move from a state of high temp to a state of low temp & does so electrically...

No?

Answer 5

only if there is a junction of two different metals. Not just if it is a bit of wire