TED: Forget Wi-Fi. Meet the new Li-Fi Internet | Harald Haas

The video discusses the potential of Li-Fi technology, which uses LED lights to transmit data to solar cells, acting as receivers. This method is energy-efficient and can help bridge the digital divide by connecting billions of devices to the Internet. The presenter demonstrates how a solar cell can receive high-speed data from an LED lamp, even in challenging conditions like fog. The technology promises to integrate with existing infrastructure, offering a sustainable solution for expanding Internet connectivity without increasing energy consumption.

What is the primary goal of using LED lamps and solar cells for data transmission?

• To increase the speed of internet connections

• To create a new form of wireless communication

• To expand the internet in an energy-efficient way

• To replace Wi-Fi technology entirely

How does Li-Fi technology transmit data?

• Using sound waves

• Via infrared signals

• By changing the brightness of LEDs

• Through radio waves

What is the role of solar cells in the Li-Fi system?

• To amplify the light signals from LEDs

• To act as receivers for data transmitted by LEDs

• To generate electricity for LED lamps

• To store data transmitted by LEDs

What was demonstrated in the practical example with the LED lamp and solar cell?

• The LED lamp can transmit data without any receiver

• The solar cell can only harvest energy, not data

• The solar cell can receive and decode data from the LED lamp

• The LED lamp can only transmit data in visible light

What happens when the light to the solar cell is blocked during the demonstration?

• The video stops and energy harvesting ceases

• The solar cell starts generating more energy

• The LED lamp turns off

• The video continues to play

How does the solar cell continue to function when partially blocked, like with fog?

• It stops functioning completely

• It receives enough light to decode data

• It switches to a backup power source

• It uses stored energy to continue

What is a potential future application of solar cells as receivers?

• To eliminate the need for LED lights

• To act as broadband receivers in remote areas

• To replace all existing internet infrastructure

• To power entire cities