How does an LED work?

The video tutorial explains the differences between conventional lighting and LED technology. It covers the basic operation of LEDs, including the role of semiconductors and electron flow. The tutorial also highlights the health concerns associated with blue light emitted by LEDs and discusses the energy-saving benefits of LED technology, which contributed to a Nobel Prize award.

What is the primary reason incandescent bulbs are considered inefficient?

• They generate heat before producing light.

• They require a lot of maintenance.

• They produce more light than heat.

• They are made from expensive materials.

How do LEDs produce light differently from conventional bulbs?

• By burning a gas inside a tube.

• By reflecting sunlight.

• By using a semiconductor to convert electrical energy directly into light.

• By using a filament that glows.

What is the role of the p-n junction in an LED?

• It facilitates the flow of electrons to produce light.

• It filters out harmful light.

• It cools down the LED.

• It stores electrical energy.

Why is blue light from LEDs considered a health concern?

• It is more expensive to produce.

• It attracts insects.

• It is too dim for effective lighting.

• It can disrupt sleep patterns and affect health.

What is a significant benefit of using LED lamps over traditional lighting?

• They consume significantly less energy.

• They are cheaper to manufacture.

• They produce more heat.

• They are available in more colors.