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The voltage needed for starting the glow of the lamp and the voltage, when the lamp extinguishes, are not equal. Explain why?

The voltage needed for starting the glow of the lamp and the voltage, when the lamp extinguishes, are not equal. Explain why? 

Grade:12th pass

2 Answers

Shobhit Varshney IIT Roorkee
askIITians Faculty 33 Points
9 years ago
Hi,

To get the lamp started you need a spike ofhigh voltageto get the arc started. The colder the lamp is, the higher voltage you need to get a start. The voltage 'forces' current through the argon gas. Gas has a resistance, the colder the gas, the higher the resistance, therefore you need a higher voltage with colder temperatures.

thanks
Shivam jha
11 Points
6 years ago
To get the lamp started you need a spike ofhigh voltageto get the arc started. The colder the lamp is, the higher voltage you need to get a start. The voltage `forces` current through the argon gas. Gas has a resistance, the colder the gas, the higher the resistance, therefore you need a higher voltage with colder temperatures.

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