Define : Work, Power and Energy. State their SI units.

Work: Work is said to be done by a force, when a body undergoes displacement in the direction of force.
SI Unit - joule (J)
Power: The work done per second is called power.
W
$\mathrm{P}=\frac{\mathrm{W}}{\mathrm{t}}$
SI Unit : joule/sec (or) watt.
Energy: Energy of a body is capacity to do work.
SI Unit : joule