Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

What voltage is across the contacts in line #8 in the schematic?

1. 120 volts

2. 0 volts

3. 240 volts

4. 480 volts

The correct answer is: 240 volts

The voltage across the contacts in line #8 would be 240 volts, which is typically used in residential and commercial electrical systems for larger appliances or equipment requiring higher power. In many HVAC systems, certain components, such as compressors and certain types of heating elements, operate at 240 volts. This voltage level is standard for these applications and is designed to deliver the appropriate amount of electrical current needed for efficient operation. To determine the voltage in the context of the schematic, it's essential to consider the system's design specifications and the common voltages employed in HVAC configurations. If the schematic indicates components or configurations which are known to use 240 volts power supply, then the correct choice aligns with that practice. Understanding the typical usage of electrical voltages in HVAC systems can help in recognizing standard operation values found in various schematic designs.