Which transformer is designed to reduce voltage levels?

A step down transformer is specifically designed to reduce voltage levels in an electrical system. It achieves this by having more turns of wire in the primary winding compared to the secondary winding. When alternating current passes through the primary winding, a magnetic field is created, which induces a lower voltage in the secondary winding due to the difference in the number of turns.

This type of transformer is commonly used in various applications where lower voltage is needed for safe operation, such as providing power to residential or commercial loads that require reduced voltage levels. Additionally, the ability to step down voltage is crucial for ensuring that electrical devices operate efficiently and safely without the risk of damage from excess voltage.

Conversely, a step up transformer increases voltage, a voltage regulator maintains a constant voltage level, and a capacitor stores electrical energy and does not directly modify voltage levels in the same way a transformer does. Thus, the step down transformer is the correct answer for reducing voltage levels.