CKLA 4th Grade Unit 4 The Lightbulb Eureka!

What impact did the light bulb have on nighttime activities?

• It made them more dangerous.
• It made them more difficult.
• It made them more expensive.
• It made them more possible.

Why did Thomas Edison start a company to supply electricity to customers?

• He wanted to give jobs to pople.

• He wanted to make his family proud.

• He realized the potential in selling both light bulbs and electricity.

• He wanted to be the head of a big company so he could be in charge.

What were some of the drawbacks of early sources of light before the invention of the light bulb?

• They were expensive and unreliable.
• They were very dim.
• They gave off unwanted heat.
• A, B, and C

What was the role of the filament in the functioning of a light bulb?

• To provide electricity to the bulb.
• To hold the bulb in place.
• To create light when heated.
• To regulate the amount of light produced.

How did sources of light change after the invention of the light bulb?

• They became less popular.
• They became less efficient.
• They became more reliable.
• They became more expensive.

According to the text, which of the following is NOT mentioned as an example of an invention made possible by the light bulb?

• The telephone.
• The electric fan.
• The dishwasher.
• The toaster.

Why did Thomas Edison experiment for two years before coming up with a successful filament?

• He was trying to find the right material.
• He was busy with other projects.
• He was struggling with financial issues.
• He was a perfectionist.

How did Thomas Edison's light bulb differ from previous electric lights?

• It was smaller.
• It was dim and lasted fewer hours.

• It was more reliable and brighter.

• It was more expensive and harder to buy..

What was one result of the light bulb on society and daily life?

• It allowed for safe travel after dark.
• It led to the invention of the car.
• It made factories not work as well.
• It made nighttime activities more difficult.

Who invented the lightbulb?

• Thomas Edison

• Benjamin Franklin

• Hedy Lamarr

• George Washinton Carver