Which device converts electrical energy into kinetic energy (motion)?

Which device converts electrical energy into kinetic energy (motion)?

• A. Inductor
• B. Motor
• C. Heater
• D. Microphone

Answer: (B)

Energy conversion is the key idea: turning electrical energy into motion is what a motor does. When current flows through a motor’s windings, it creates magnetic fields that interact with magnets or other windings, producing torque that makes a shaft rotate. That rotation is kinetic energy—the motion produced from electrical energy. The other devices don’t produce motion from electricity. An inductor stores energy in a magnetic field and mainly affects current flow; it doesn’t drive motion. A heater changes electrical energy into heat through resistance, not motion. A microphone detects sound and converts it into electrical signals, so it’s sensing energy rather than creating motion from electricity.

Energy conversion is the key idea: turning electrical energy into motion is what a motor does. When current flows through a motor’s windings, it creates magnetic fields that interact with magnets or other windings, producing torque that makes a shaft rotate. That rotation is kinetic energy—the motion produced from electrical energy.

The other devices don’t produce motion from electricity. An inductor stores energy in a magnetic field and mainly affects current flow; it doesn’t drive motion. A heater changes electrical energy into heat through resistance, not motion. A microphone detects sound and converts it into electrical signals, so it’s sensing energy rather than creating motion from electricity.