Energy

Question 1

What is energy?

Answer 1

• Energy is defined as the ability to do work.
• A combination of energy and matter make up the universe!

Question 2

What are the Laws Of Energy and Conservation?

Answer 2

• Energy can’t be created or destroyed.
• It may be transformed from one form into another.
• The total amount of energy always stays the same.

Question 3

What are the 9 Forms Of Energy?

Answer 3

1. Gravitational: e.g. a book on the top shelf.
2. Electrical: e.g. battery, solar cells.
3. Elastic: e.g. rubber band.
4. Kinetic: e.g. anything that moves.
5. Sound: e.g. music, singing.
6. Light: e.g. the sun.
7. Nuclear: e.g. nuclear bombs.
8. Chemical: e.g. fuels like natural gas.
9. Thermal: e.g. boiling a kettle, heat caused by friction.

Question 4

What is the difference between energy transformations and energy transfers?

Answer 4

• Energy transformations occur when one type of energy changes or transforms into another type of energy. For example electrical to light energy on a light bulb.
• Energy transfer on the over hand are when energy moves without changing forms. For example, heat moving such as a pot boiling water.

Question 5

What is Energy Efficiency and what is the formula to calculate it?

Answer 5

• Energy efficiency is the percentage of energy that is useful compared to all the energy put into a system.
• Formula %: (Useful Energy/Total Energy) x 100