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

What voltage is across the fuse in line #10 according to the schematic?

1. 120 volts

2. 240 volts

3. 0 volts

4. 12 volts

The correct answer is: 0 volts

In examining the voltage across the fuse in line #10, it's important to understand that fuses are designed to protect circuits by breaking the flow of electricity when current exceeds a certain level. In the context of the schematic, if line #10 is not conducting any current due to an open circuit or if there is a fault elsewhere in the system, the voltage across the fuse will be measured as 0 volts. When analyzing schematics, the configuration of the system and whether the circuit is complete must be taken into account. A reading of 0 volts across the fuse indicates that there is no potential difference, meaning no electricity is flowing through that part of the circuit, which is consistent with the conditions of an open circuit. Thus, the correct answer reflects an understanding of basic electrical principles in the context of HVAC systems.