Power_Presentation.power point for BS students

“Power”, explains the fundamental concept of power as the rate at which work is done or energy is transferred. It covers the main formulas for mechanical and electrical power, such as
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P=W/t,
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P=Fv, and
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P=VI, along with their units and practical meanings. The slides also discuss instantaneous and average power, efficiency, and real-life applications, giving a clear overview of how power connects force, motion, and energy transfer.

1. Power An introduction to the concept of power and its role in physics.

2. Definition of Power Power is the rate at which work is done or energy is transferred.

3. Formula for Power P = W / t, where P is power, W is work, and t is time.

4. Instantaneous and Average Power Instantaneous power is power at a specific moment; average power is total work done divided by total time.

5. Units of Power The SI unit of power is the watt (W), equal to one joule per second (J/s). Another common unit is horsepower (1 hp = 746 W).

6. Power in Mechanics In mechanics, P = Fv, where F is force and v is velocity.

7. Power in Rotational Motion For rotational systems, power is given by P = τω, where τ is torque and ω is angular velocity.

8. Power in Electricity In electrical systems, P = VI, where V is voltage and I is current. Using Ohm’s law, P = I²R or P = V²/R.

9. Efficiency Efficiency = (Useful Power Output / Total Power Input) × 100%.

10. Applications Used to determine machine performance, engine output, and energy transfer in systems.

11. Summary Power measures how quickly work or energy transfer occurs, linking force, motion, and energy.