Why Tester does not work on DC Supply || electrical interview question

I am Aayush Sharma Welcome to Our YouTube channel Electrical Dost.

About this video-
Dosto aaj es video ke andar hamne voltage tester DC Supply par work kyu nhi karta hai yeh batane ki kosish kari hai. Sath hi aapko es video mai maine electrical se judi practical working ke baare mai bhi jankari di hai. Ummed hai aapko yeh video bahut pasnd aayegi (hindi,urdu)
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#DCsupply #electricaltester #electrical #engineer #interview

Queries Solved:
1. why tester does not glow in dc
2. What is positive and negative terminal?
3. Can we use the negative battery terminal as a ground
4. DC current vs AC current

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