Which of the following is an application for DC motors?

• A. Robotics
• B. Small tools
• C. HVAC systems
• D. Electric vehicles

Answer: (D)

DC motors are a natural fit when the power source is direct current and you need strong starting torque with straightforward speed control. An electric vehicle runs off a DC battery, so a DC motor can be driven directly or with a simple controller to adjust speed, making it a practical traction option in many designs. This simplicity and direct use of the stored DC power is why DC motors are considered an application for electric vehicle drive systems.

In contrast, HVAC systems typically rely on AC motors for efficiency and cost reasons, since large fans and compressors benefit from the characteristics of AC motors. Robotics and small tools also commonly use DC motors because of their compact size and easy speed control via simple electronics, which complements battery-powered operation.