Ls 12.Pt1 Flashcards
What is the definition of conductors?
Substances which allow electric current to flow through them.
Examples include metals like copper and aluminum.
What is the definition of insulators?
Substances which do not allow electric current to flow through them.
Examples include rubber, plastic, and glass.
Who was one of the key inventors associated with the invention of the light bulb?
Thomas Alva Edison.
Edison is known for his development of the first successful incandescent light bulb.
What material did Edison try for the filament in his experiments?
Cotton thread coated with soot.
This was an early attempt to create a filament that would glow.
What did Edison use to create the glass casing for the bulb?
He made a glass casing and fitted a filament of platinum wire in it.
The glass casing was crucial to prevent the filament from burning out too quickly.
What did Edison notice about the wire when he passed electricity through it?
The wire burned out after only a few seconds.
This observation led him to experiment with removing air from the glass casing.
Fill in the blank: A _______ is a device that lights up when electric current passes through it.
bulb
What achievement did Edison feel happy about?
He successfully created a bulb that lit up continuously for 45 hours.
This was a significant milestone in the development of the electric light bulb.
True or False: Edison invented more than one thousand inventions during his lifetime.
True
What was Edison’s approach to learning science?
He learned science by performing experiments himself.
This inquisitive nature contributed to his success as an inventor.
What was the main problem Edison faced when trying to create a working bulb?
Finding a filament material that would not burn out quickly.
This required extensive experimentation with different materials.
Fill in the blank: The filament must be _______ to produce light without burning out.
heated
What was removed from the glass casing to help the filament last longer?
Air
Removing air prevents oxidation and allows the filament to glow without burning out quickly.
