Which of the following is correct regarding law of conservation of energy?
I. Energy can only be converted from one form to another.
II. Energy can be easily destroyed.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1: Only I.
Explanation:
The analysis of the statements, based on the Law of Conservation of Energy, is as follows:
Statement 1 (Correct): Energy can neither be created nor destroyed; it can only be transformed from one form into another. For example, an electric bulb converts electrical energy into light and heat energy.
Statement 2 (Incorrect): Energy cannot be destroyed. This law posits that the total energy of the universe remains constant.
Additional Facts:
- Total Energy: The total energy of an isolated system always remains constant.
- Examples of Conversion: * Loudspeaker: Electrical energy into sound energy.
- Photoelectric Cell: Light energy into electrical energy.
- Dynamo: Mechanical energy into electrical energy.
- Renewable Energy: Currently, focus is being placed on sources such as solar and wind energy, which are part of the endless cycle of energy transformation.
Potential Question for Upcoming Exams:
Question: Mechanical energy is the sum of which two forms of energy?
Answer: Potential energy and Kinetic energy.