Heat that results from passing an electrical current through a conductor is __________ heating.

• A. Dielectric
• B. Induction
• C. Frictional
• D. Resistance

Answer: (D)

Heat produced when electric current moves through a conductor comes from the electrical resistance of the material. As electrons collide with the atoms in the wire, some energy is transformed into thermal energy, so the wire heats up. This is resistive heating (also called Joule heating). The power converted to heat can be described by P = I^2R (or P = VI), meaning more current or higher resistance leads to more heat.

Dielectric heating happens in insulating materials under alternating fields, not in conductors. Induction heating uses changing magnetic fields to drive currents in a material, which is a different heating mechanism. Frictional heating comes from mechanical friction, not electrical conduction.