Question

Power dissipation per unit volume formula in a conductor

Answer 1

Joule heating, also known as Ohmic heatingand resistive heating, is the process by which the passage of an electric current through a conductor produces heat.

Joule's first law, also known as the Joule–Lenz law,[1] states that the power of heating generated by an electrical conductor is proportional to the product of its resistanceand the square of the current:

{\displaystyle P\propto I^{2}\cdot R}

Joule heating affects the whole electric conductor, unlike the Peltier effect which transfers heat from one electrical junction to another.