Energy Efficiency

The video tutorial explains the concept of energy use and waste, highlighting that while energy cannot be created or destroyed, its usefulness can be diminished as it dissipates as waste heat. It uses a food mixer as an example to illustrate energy transfer, where only movement is useful, and sound and heat are wasted. The tutorial also covers how to visualize energy efficiency using diagrams and compares the efficiency of filament and LED bulbs, showing why LEDs are preferred. It concludes with methods to improve energy efficiency, such as using insulation and reducing friction.

What happens to the energy used by a food mixer?

How can we represent the amount of useful and wasted energy visually?

What is the efficiency of an old-fashioned filament bulb?

Explain how lubrication can improve energy efficiency.

What methods can be used to reduce heat loss in a house?