Science
Efficiency of machines
मशीनों की दक्षता
In Class 9 Science, this topic explains how efficiently a machine converts the work supplied to it into useful output work. Students learn the meaning of efficiency, use the relation efficiency = (useful output work ÷ input work) × 100, and understand why real machines are below 100% efficient because of friction, heat, sound, and deformation. The topic connects efficiency with mechanical advantage and the effort needed in simple machines, helping learners interpret formulas and solve basic numerical problems from Work, Energy, and Simple Machines.
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Practice questions are not available for this topic yet. We plan to add questions with clear explanations soon. You can keep practising other topics in the meantime.
- Class / subject
- 9 · Science
- Chapter
- Work, Energy, and Simple Machines
- Topic
- Efficiency of machines
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