Work Energy Power Class 10 Notes for ICSE Physics. In this articles you would learn definition and various unit of work, Measurement of work. Definition and unit of power in SI and CGS.. Visit official Website CISCE for detail information about ICSE Board Class-10 Physics.
Work Energy Power Class 10 Notes for ICSE Physics
Point to be Discuss |
| Definition and various unit of work in SI and CGS |
| Definition and unit of power in SI and CGS.. |
| Work Done by the Force of Gravity |
| Relation Between SI and CGS Unit |
| Definition of Power and its Unit in SI and CGS. |
| Energy and Its Unit in SI and CGS. |
Definition of Work
Work’ is said to be done when the applied force makes the body move i.e., there is a displacement of body.
Measurement of Work
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
W = F x S
W = F x S x Cos θ
Factors on Which Work Done Depends
Work done depends on the force applied
the displacement experienced by the object.
the angle between the force and displacement
Factors on Which No Work Done Depends
If No displacement
If force applied Perpendicular to displacement
Work Done by the Force of Gravity
W = F x S = mg x h = mgh
W = F x S =
W/ t = F x S / t divide by t
Power = F x V
(p=w/t and S/T= v)
SI and CGS Unit of Work
The SI unit of work idone s ‘joules’ or Newton Meter and the CGS unit is ‘erg’./ dyne cm
Relation Between SI and CGS Unit
S.I. unit of work is joule and C.G.S. unit of work is erg.
Since, work = Force x displacement
1 joule = 1 newton x 1 metre
= 105 dyne x 100 cm
= 105 dyne x 102 cm
= 107 erg
1 joule = 107 erg
Definition of Power
Power is the rate at which work is done or energy is transferred.
Power = Work Done / Time
Unit of power in SI and CGS.
In the SI system, the unit of power is the watt (W), which is equivalent to one joule per second (J/s). In the CGS system, the unit of power is ergs per second (erg/s)
1 H.P. = 746 watt
Relation between Unit of power in SI and CGS.
SI unit of power = watt
CGS unit of power = erg per second
1` W = 1 J s -1 = 107 erg s –
Energy and Its Unit in SI and CGS
Energy is defined as the capacity to do work.
The SI unit of energy is the joule (J),
while the CGS unit is the erg
1 J = 107 erg
1 watt hour = 3600 j
1 Kilowatt hour = 1000 w x 3600 j
= 3.6 x 106 j
1 calories = 4.18 j = 4.2 j (appr)
1 Kilocalories = 1000 x 4.18 j = 4.2 j (appr)
= 4180 j
1 eV = 1.6 x 10-19 j
–: End of Work Energy Power Class 10 Notes for ICSE Physics :–
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