You are here
š¬ One capacity, many costumes
The energy in your food, in a glowing bulb, in a ringing bell — same idea, different forms. And one form can turn into another.
What are the different forms of energy?
- Energy exists in many forms: mechanical (motion or position), thermal (warm/hot), light , sound , electrical , nuclear (stored in nuclei), and chemical (stored in fuels and food).
- Energy can change from one form to another: electrical → light in a bulb; chemical (food) → mechanical in our muscles; mechanical → sound in a ringing bell.
- We will focus next on mechanical energy , since it connects directly to the forces and motion studied earlier.
Important Definitions
- Forms of energy — energy can exist as mechanical, thermal, light, sound, electrical, nuclear and chemical energy, and can be converted from one form to another.
- Chemical energy — energy stored in fuels and food in the form of chemical bonds between atoms.
āøā¶ Pause and Ponder
- 3. Pedalling a bicycle on a flat road: the chemical energy in your muscles becomes mainly mechanical (kinetic) energy of the moving bicycle, along with some thermal energy (your body and the moving parts warm up) and a little sound energy .
NCERT Question 4 — For each of the following
Identify the energy transformation in nine situations (truck uphill, watch spring, photosynthesis, dam water, matchstick, fire cracker, microphone, bulb, solar panel).
View the answer →