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Questions and Answers
What is the purpose of the inert gas in an incandescent light bulb?
What is the purpose of the inert gas in an incandescent light bulb?
- To increase the light output
- To reduce the manufacturing costs
- To protect the filament from oxidation (correct)
- To regulate the electrical current
Why are incandescent bulbs widely used in household and commercial lighting despite their low efficiency?
Why are incandescent bulbs widely used in household and commercial lighting despite their low efficiency?
- Low manufacturing costs and compatibility with both AC and DC (correct)
- Energy-saving features and environmental benefits
- Easier replacement and maintenance
- High light output and longer lifespan
What percentage of the energy consumed by incandescent bulbs is converted into visible light?
What percentage of the energy consumed by incandescent bulbs is converted into visible light?
- Less than 5% (correct)
- More than 70%
- Close to 100%
- Around 30%
What is the luminous efficacy of a typical incandescent bulb for 120 V operation?
What is the luminous efficacy of a typical incandescent bulb for 120 V operation?
What provides mechanical support and electrical connections to the filament in an incandescent bulb?
What provides mechanical support and electrical connections to the filament in an incandescent bulb?
Why do incandescent bulbs not require external regulating equipment?
Why do incandescent bulbs not require external regulating equipment?
What is the main reason for the phase-out of incandescent light bulbs by some governments?
What is the main reason for the phase-out of incandescent light bulbs by some governments?
According to historians Robert Friedel and Paul Israel, what factors contributed to Thomas Edison's success with the incandescent lamp?
According to historians Robert Friedel and Paul Israel, what factors contributed to Thomas Edison's success with the incandescent lamp?
Who was the inventor credited with the demonstration of a constant electric light at a public meeting in Dundee, Scotland in 1835?
Who was the inventor credited with the demonstration of a constant electric light at a public meeting in Dundee, Scotland in 1835?
What type of lamps are used for industrial processes such as paint curing and space heating?
What type of lamps are used for industrial processes such as paint curing and space heating?
Which material did Humphry Davy use to create an incandescent light in 1802?
Which material did Humphry Davy use to create an incandescent light in 1802?
What was the main reason cited by historians for Thomas Edison's success with the incandescent lamp?
What was the main reason cited by historians for Thomas Edison's success with the incandescent lamp?
What was the main problem with the incandescent light created by Humphry Davy in 1802?
What was the main problem with the incandescent light created by Humphry Davy in 1802?
What did James Bowman Lindsay demonstrate at a public meeting in Dundee, Scotland in 1835?
What did James Bowman Lindsay demonstrate at a public meeting in Dundee, Scotland in 1835?
What was the main component in Thomas Edison's system of electric lighting?
What was the main component in Thomas Edison's system of electric lighting?
What did Ebenezer Kinnersley demonstrate in 1761?
What did Ebenezer Kinnersley demonstrate in 1761?
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