If a DC filament supply is used, it is...

Question 1 / 270706RGpcIufEzHHhat6KnaU

Question 1 of 270706RGpcIufEzHHhat6KnaU

If a DC filament supply is used, it is advisable to periodically reverse the polarity of the filament potential:

Question 1 of 27070

If a DC filament supply is used, it is advisable to periodically reverse the polarity of the filament potential:

🔍 Key Concepts

• DC filament supply behavior over time • How electron emission affects one end of a filament more than the other in DC service • Difference between filament life and power source life

💭 Think About

• What happens to the filament surface closest to the negative side of a DC supply compared with the positive side over long periods? • Would reversing polarity change how much work the power source does, or only where on the filament the wear occurs? • If you periodically reverse the polarity, how does that affect the way the filament ages physically?

✅ Before You Answer

• Be clear on what a filament is and how it emits electrons in a DC circuit • Decide whether polarity reversal would realistically reduce stress on the filament, the power source, or both • Ask: does the power source "wear" differently depending on which terminal is positive, or is the filament the component that experiences uneven wear?

Question 1 of 27070

If a DC filament supply is used, it is advisable to periodically reverse the polarity of the filament potential:

To lengthen the life of the filament

To lengthen the life of the power source

Both A & B

None of the above