Work, Energy and Power
Work, Energy And Power
[ 1 ] Work :
- Definition:
Work Is A Physical Quantity That Measures The Transfer Of
Energy When A Force Acts Upon An Object, Causing It To Move
In The Direction Of The Force.
- Formula:
The Formula For Calculating Work Is Given By
W = F * D * Cos θ
Where
- W Represents
Work
- F Is The
Magnitude Of The Applied Force
- D Is The
Displacement Of The Object
- θ Is The Angle Between The Force And The Direction Of
Displacement.
- The SI Unit Of Work Is Joule (J). 1 J = 1 N ⋅ M = 1 Kg ⋅
M^2/S^2.
- Scalar Quantity:
Work Is A Scalar Quantity, Which Means It Only Has Magnitude
And No Specific Direction.
- Positive And Negative
Work And Zero Work :
- When The Force And Displacement Are In The Same
Direction, The Work Done Is Positive.
- When The Force And Displacement Are In Opposite
Directions, The Work Done Is Negative.
- If There Is No Displacement Or The Force Applied Is
Perpendicular To The Displacement, The
Work Done Is Zero.
- Work Is Directly Related To The Transfer Of Energy. When
Work Is Done On An Object, Energy Is Transferred To It,
Either Increasing Its Kinetic Energy Or Potential Energy.
- If Multiple Forces Act On An Object, The Work Done By Each
Force Can Be Calculated Separately, And The Total Work Done
Is The Sum Of Individual Work Done By Each Force.
- Applications :
- Calculating The Work Done By Machines.
- Determining The Amount Of Energy Expended In Different Processes.
- Understanding The Efficiency Of Mechanical Systems.
[ 2 ] Energy :
- Definition:
Energy Is A Fundamental Concept In Physics That Represents
The Ability Of A System To Do
Work Or Cause A Change.
- It Is A Scalar Quantity And Is Measured In Joules (J) In The
International System Of Units (SI).
- Forms Of Energy:
Energy Exists In
Various Forms
Kinetic Energy
(Energy Of Motion)
Potential Energy
(Stored Energy)
Thermal Energy
(Heat)
Electrical Energy
Chemical Energy
Nuclear Energy
Magnetic Energy
Gravitational Energy
- The Law Of Conservation Of Energy States That Energy Cannot
Be Created Or Destroyed; It Can Only Be Transferred Or
Transformed From One Form To Another. The Total Energy Of
An Isolated System Remains Constant.
- Applications :
- Engineering
- Environmental Sciences
- Thermodynamics
- Understanding The Behavior Of Physical Systems
[ 3 ] Power :
- Definition:
Power Is A Physical Quantity That Measures The Rate At Which
Work Is Done Or The Rate At Which Energy Is Transferred Or
Transformed. It Quantifies How Quickly Energy Is Expended Or
Generated.
- Formula:
- The Formula For
Power Is Given By P = W / T
Where
- P Represents
Power
- W Is The Amount
Of Work Done
- T Is The Time
Taken To Do The Work
- Alternatively, For A Constant Force, Power Can Be Calculated
As P = F * V, Where F Is The Applied Force And V Is The
Velocity Of The Object.
- The SI Unit Of
Work Is Watts (W).
- Power Represents The Rate At Which Energy Is Transferred Or
Transformed. If A Certain Amount Of Work Is Done In A
Shorter Time, The Power Exerted Is Greater.
- Unit Of Power :
- 1 Watt = 1 J/S = 1 Kg-M^2/S^3
- Horsepower(HP) = 746 Watts
- Kilowatts(Kw) = 1×10^3W
- Megawatts(MW) = 1×10^6W
- Gigawatts(GW) = 1×10^9W
- Decibel-Milliwatts(Dbm) = 30 Dbm = 1 W
- British Thermal Unit/Hour(BTU/Hr) = 3.412142 BTU/Hr = 1 W
- Calories Per Second(Cal/Sec) = 0.24 Calories Per Second
Cal/Sec = 1 W
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