Practice mode Reading Comprehension

Why does the author mention Joseph Swan in the passage about the invention of the light bulb?

Read the passage: Thomas Edison is often described as the inventor of the light bulb, but the story is more complicated. Several inventors had already produced lamps that glowed when electricity passed through a thin thread, or filament. The problem was that the filaments burned out quickly. In England, Joseph Swan demonstrated a working carbon-filament lamp at around the same time that Edison was developing his own in the United States. Edison's team tested a huge range of materials, finally settling on carbonised filaments that lasted far longer than earlier versions. Just as importantly, Edison designed a whole system of generators and wiring to supply homes with power. The two men later joined forces to form a company in Britain.

Correct answer C. To show that Edison was not the only person developing electric lamps

Explanation

The author says the story is more complicated and mentions Swan demonstrating a lamp at around the same time, showing that Edison was not the only inventor of electric lighting.

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Open question

Why does the author mention Joseph Swan in the passage about the invention of the light bulb?

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