What causes heat to be produced when current flows through a conductor?

What causes heat to be produced when current flows through a conductor?

• A. The power of the source
• B. The resistance of the conductor
• C. The conductor's inductance
• D. The circuit's capacitance

Answer: (B)

Heat is produced when current flows through a conductor because the moving electrons collide with the atoms in the material, turning part of the electrical energy into thermal energy. The rate of this energy conversion depends on the conductor’s resistance and the current, described by the power dissipated as P = I^2 R. In other words, the resistor-like behavior of the material converts electrical energy into heat; the heat rises with both how much current flows and how much resistance the material has. Inductance and capacitance involve storing energy in magnetic and electric fields, respectively, and don’t continuously convert that stored energy into heat in a simple conduction scenario. The power from the source supplies energy, but heat in the conductor comes from the resistance converting that energy into thermal energy.

Heat is produced when current flows through a conductor because the moving electrons collide with the atoms in the material, turning part of the electrical energy into thermal energy. The rate of this energy conversion depends on the conductor’s resistance and the current, described by the power dissipated as P = I^2 R. In other words, the resistor-like behavior of the material converts electrical energy into heat; the heat rises with both how much current flows and how much resistance the material has. Inductance and capacitance involve storing energy in magnetic and electric fields, respectively, and don’t continuously convert that stored energy into heat in a simple conduction scenario. The power from the source supplies energy, but heat in the conductor comes from the resistance converting that energy into thermal energy.