Power in Physics Definition:
The rate at which work is done by a body or energy is transferred is called its power.
We are giving a detailed and clear sheet on all Physics Notes that are very useful to understand the Basic Physics Concepts.
What is Power in Physics | Definition, Formula, Units – Work, Energy and Power
Power in Physics Formula:
Power = Rate of doing work = \(\frac{\text { Work done }}{\text { Time taken }}\)
If under a constant force F a body is displaced through a distance s in time t, then the power P = \(\frac{W}{t}=\frac{\mathbf{F} \cdot \mathbf{s}}{t}\)
But \(\frac{s}{t}\) = v, uniform velocity with which body is displaced.
∴ P = F . v = F v cos θ
where, θ is the smaller angle between F and v.
Power is Scalar Quantity.
Power Unit in SI
SI unit is watt.
Power Dimensional Formula
Dimensional formula is [ML²T-3].
Its other units are kilowatt and horse power,
- 1 kilowatt = 1000 watt
- 1 horse power =746 watt
- 1 kWh = 3.6 x 106J
Work, Energy and Power:
Work, energy and power are the three quantities which are inter-related to each other. The rate of doing work is called power. An equal amount of energy is consumed to do a work. So, basically the power is the rate at which energy is consumed to complete a work.
| Work | Energy |
| Conservation of Energy | Power |
| Collisions | Elastic and Inelastic Collisions in One Dimension |
| Collisions in Two Dimensions |