Electrical to kinetic energy conversion

Steps:

• Identify the target energy transformation: electrical to kinetic (motion).
• Recall device functions: motors use electricity to produce mechanical motion.
• Eliminate options that produce heat or light instead of motion.
• Confirm motor as the device that directly converts electrical energy to kinetic energy via electromagnetic force.

Why D is correct:

• An electric motor converts electrical energy to kinetic energy through the interaction of magnetic fields and current, following Lorentz's force law (F = q(v × B)).

Why the others are wrong:

• A. Iron: A material, not a device; no energy conversion function.
• B. Kettle: Converts electrical energy to thermal energy for heating water.
• C. Lamp: Converts electrical energy to light (radiant) and some thermal energy.

Final answer: D