Question

what energy transformation causes the blades of an electric fan to move when an electric fan is turned on?
electrical → mechanical
heat → electrical
chemical → thermal
sound → mechanical

Explanation:

An electric fan runs on electrical energy from the power source. When turned on, the motor converts this electrical energy into mechanical energy to rotate the blades, causing them to move. The other options are incorrect: heat to electrical (e.g., thermoelectric) isn't how fans work, chemical to thermal (e.g., combustion) is unrelated, and sound to mechanical doesn't apply here.

Answer:

A. Electrical → Mechanical