Class 9 Exam > Class 9 Videos > Science Class 9 > Power
Power Video Lecture | Science Class 9
FAQs on Power Video Lecture - Science Class 9
| 1. What is power in physics? |  |
Ans. In physics, power refers to the rate at which work is done or energy is transferred. It is the measure of how quickly work can be done or energy can be transformed.
| 2. How is power calculated? | |
Ans. Power can be calculated by dividing the amount of work done or energy transferred by the time taken to perform the work or transfer the energy. The formula for power is P = W/t, where P is power, W is work, and t is time.
| 3. What are the units of power? | |
Ans. The SI unit of power is the watt (W), which is equal to one joule per second (1 J/s). Other commonly used units of power include horsepower (hp) and kilowatt (kW).
| 4. What is the difference between power and energy? | |
Ans. Power and energy are related concepts but have different meanings. Power is the rate at which work is done or energy is transferred, whereas energy is the ability to do work or cause change. Power is measured in watts, while energy is measured in joules.
| 5. How does power relate to electrical devices? | |
Ans. In the context of electrical devices, power represents the rate at which electrical energy is converted into other forms of energy. It determines how quickly an electrical device can perform its intended function, such as producing light, heating, or mechanical work. The power rating of electrical devices is typically stated in watts or kilowatts.
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Sep 02, 2025
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Video Description: Power for Class 9 2025 is part of Science Class 9 preparation.
The notes and questions for Power have been prepared according to the Class 9 exam syllabus.
Information about Power covers all important topics for Class 9 2025 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Power.
Introduction of Power in English is available as part of our Science Class 9 for Class 9 & Power in
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Class 9 Exam by signing up for free.
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Video Lecture & Questions for Power Video Lecture | Science Class 9 - Class 9 full syllabus preparation | Free video for Class 9 exam to prepare for Science Class 9.
Information about Power
Here you can find the meaning of Power defined & explained in the simplest way possible.
Besides explaining types of Power theory, EduRev gives you an ample number of questions to practice Power tests,
examples and also practice Class 9 tests.
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