Work(w) : A form of energy transferred from system to the surroundings or from surroundings to the system due to difference in some property (other than temperature) between system and surroundings.
Types of work
- Mechanical work (due to difference in pressure) – work of expansion or compression or p – V work, Mechanical work = force x displacement
- Electrical work (due to difference in electrical potential) = - Emf x quantity of electricity passed
Sign Convention
- If work is done on the system, w = +ve (compression)
- If work is done by the system, w = -ve (expansion)
