Question
Download Solution PDFWhich of the following lamps is used for the determination of polarity of DC mains?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFNeon discharge lamps are used as night lamps and indicator lamps and are used for the determination of the polarity of DC mains and advertising purposes.
Neon lamps are used to measure the electrical polarity of DC mains due to their ability to create light through glow discharge. This is achieved by ionizing the atoms and producing free electrons, creating a plasma state.
When a neon lamp is connected across a DC source, the direction of the glow indicates the polarity of the voltage. If the lamp glows, it indicates that the applied voltage has the correct polarity. If there is no glow, it suggests that the polarity is reversed.
Additional Information Application of different lamps:
|
Types of Lamp |
Application |
|
Neon lamps |
visual indicators in electronic equipment and appliances |
|
Fluorescent lamps |
commercial lighting, industrial lighting, classroom lighting, |
|
Sodium vapor lamp |
roadways, parking lots, security areas, airports, goods yards |
|
Carbon arc lamp |
cinema projector, searchlight, flash camera |
Last updated on Jun 16, 2025
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