What device is used to convert 110 volts to 24 volts in an electrically operated control system?

The correct device for converting 110 volts to 24 volts in an electrically operated control system is a transformer. Transformers operate on the principle of electromagnetic induction, where an alternating current in one coil creates a magnetic field that induces a voltage in another coil. This allows transformers to either step up (increase) or step down (decrease) voltage levels based on the turns ratio of the coils.

In this case, a transformer specifically designed for stepping down voltage can efficiently convert the higher voltage (110 volts) to a lower voltage (24 volts) needed for the control system. This is essential for ensuring that sensitive electronic components receive the correct voltage for proper functioning and safety.

The other options, while they have their own uses, do not serve the function of modifying voltage levels in the same manner. Resistors dissipate energy as heat and cannot step down voltages effectively. Condensers, or capacitors, store electrical energy and are used in various circuit applications but do not convert voltages. Compressors are used in mechanical systems to compress gases and do not deal with electrical voltage conversion.