Energy Transformation

The video explains how energy from the sun is converted into various forms through processes like photosynthesis and mechanical operations. It highlights the first law of thermodynamics, stating energy cannot be created or destroyed, only transformed. The video also discusses energy use in vehicles, noting that not all energy is converted to kinetic energy due to losses as sound and heat. Engine efficiency is explained as the ratio of useful energy output to total energy input, with no device being 100% efficient.

How is the efficiency of an engine calculated?

Discuss why no device can be 100% efficient.