Determining Central Idea in Informational Text - Level F - Quiz

Which of these details does NOT support the central

idea?

Central Idea: Even though one of Edison's inventions failed, he never stopped

trying out new ideas.

The vocal engine was a cumbersome device for the

user.

The voca

The vocal engine had a few fatal flaws.

Sound waves are not powerful enough to make the

vocal engine useful.

+) Edison created a version of the light bulb that

was affordable and long-lasting.