Question

define the term energy and power give their SI unit​

Answer 1

Capacity to do work is caller Energy.

• S.I unit=joule (J)
• It is denoted by E

Types of Energy

Mechanical Energy:Energy which is due to velocity of object or change in position or configuration of any object is caller Mechanical Energy

• It is of two types:-

i)Kinetic energy:Energy due to the motion(velocity) of object

K.E=1/2 m(v) ^2

ii)Potential energy:Energy due to change in position and configuration of a body

P.E=mgh

The rate of doing work or the rate of transfer of energy is known as Power

• S.I unit=watt (W)
• It is denoted by W

Power=work/time

P=W/t

Answer 2

!! Energy !!

Energy can be defined as the work done per unit time. It's unit is joule (J). E =W/T

The Capacity of doing work is called Energy.

Energy is the force acting on an object.

Power Derived from the utilisation of physical and chemical resources to provide heat and light for running of Machines is Known as Energy.

Energy is invisible, responsible for all forces and measured in joules.(J).

!! Power !!

The rate at which energy is used by an electrical appliance is called Powet

$Power = \frac{Work}{Time}$

$Power = \frac{Energy}{Time}$

$Or \: P = \frac{W}{T}$

$W = {I}^{2} Rt = \frac{ {v}^{2} }{r} T = VIt \:$

P = I²Rt [in terms of I and R]

Or, P = V²/R [in terms of V and R]

Or, P = V×I [in terms of V and I]

SI Unit of power is Watt. Power is a Scalar Quantity.