Question
During energy transformation, the total energy of a system:
The correct answer is
remains unchanged
Energy Transformation: Conservation Principle
The question asks about the behavior of the total energy of a system during energy transformation.
The fundamental principle governing this is the Law of Conservation of Energy. This law states that energy cannot be created or destroyed, only converted from one form to another.
- In any closed system, the total amount of energy remains constant over time.
- When energy transforms (e.g., chemical energy to heat energy, or potential energy to kinetic energy), the total energy before and after the transformation is the same.
- Some energy might become less useful (e.g., dissipated as heat), but the overall quantity is conserved.
Therefore, during energy transformation, the total energy of a system remains unchanged.
Option Analysis:
- Option 1: remains unchanged - This aligns with the Law of Conservation of Energy.
- Option 2: always decreases - Incorrect. Energy is conserved, not lost.
- Option 3: disappears completely - Incorrect. Energy cannot disappear.
- Option 4: always increases - Incorrect. Energy cannot be created spontaneously within the system.
The correct option reflects the principle of energy conservation.
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Important Questions from Work Power and Energy
- The work done by a 10 Newton force acting on a body, which results in the displacement of 2 m in the direction of the force, is __________.
- An object of mass 1 kg is moving with a velocity 10 m/s. Find the kinetic energy of the object.
- The efficiency of a machine can never be ______.
- In practice, the work output of a machine is ______ the work input due to the effect of friction.
- How much energy is used by an 80% efficient, 2kW motor running at a peak load for 5 hours?
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