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.

What process do plants use to convert sunlight into chemical energy?

• Transpiration

• Fermentation

• Photosynthesis

• Respiration

According to the first law of thermodynamics, what can happen to energy?

• It can be destroyed

• It can be created

• It can be transformed

• It can disappear

In vehicles, what is the primary form of energy produced from fuel?

• Kinetic energy

• Nuclear energy

• Electrical energy

• Potential energy

What percentage of chemical energy in fuel is typically converted to kinetic energy in a motorbike?

• 20%

• 10%

• 30%

• 50%

What happens to the energy that is not converted to kinetic energy in engines?

• It is converted to light

• It is lost as sound and heat

• It is recycled

• It is stored