Define work , power and Energy . State their S.I . Units .

Explanation

Work : The product of magnitude of displacement (S) and component of force ` (F cos theta)` along the direction of displacement is called work . ie., ` w = vec(F) . vec(S) = F S cos theta`
Unit :Joule
Power : The rate of doing work by a force is called power . i.e., `P = (W)/(t)`
Unit : watt or J/S
Energy : The ability or the capacity to do work is called energy .
Unit : Joule