Is clockwise work positive or negative?

Is clockwise work positive or negative?

In cyclic process, work done is equal to the area of closed curve. It is positive if the cycle is clockwise and it is negative if the cycle is anticlockwise.

Where did the term clockwise come from?

An old Scottish word that is still used is “widdershins”, meaning “against the motion of the Sun”, or counterclockwise. There’s an old Gaelic word (also still in some usage) of “deasil”, meaning to turn to the right, or clockwise.

Why is clockwise positive?

The net work done by the gas during one cycle is represented with the area enclosed by the curve in a p-V plot. The work is positive when it is traversed clockwise because the work done by the gas during expansion is then larger than the work during compression.

In which thermodynamic process work done is negative?

Positive work is done on the gas when the gas is compressed; negative work is done on the gas when the gas expands. zero work is done on the gas when the gas volume is fixed.

Is work done zero in cyclic process?

The cyclic process is the process which has the same initial and the final state of the system. So, the energy of the system in its initial and final position is the same. So, the internal energy of the system is zero. Thus, work done is zero.

What is 0 in a cyclic process?

The change in energy in a cyclic process is zero, since the initial and final states are the same. The work done and the quantity of heat gained in such a process are therefore the same with opposite signs (R = –Q).

What is a cyclic process?

In a cyclic process, the system starts and returns to the same thermodynamic state. A cyclic process is the underlying principle for an engine. If the cycle goes counterclockwise, work is done on the system every cycle. An example of such a system is a refrigerator or air conditioner.

Are all cyclic processes reversible?

Ans: All the processes which are cyclic are reversible but not all reversible processes are cyclic. In a process which is cyclic the system needs to follow the complete cycle to reach the initial state. Thus, the cycles which are reversible are those in which the system can follow the exact same path backwards.

What is cyclic process explain with a PV diagram?

The P – V diagram for a cyclic process is a triangle ABC drawn in order. The co-ordinates of A, B, C are (4,1), (2,4), and (2,1). The co-ordinates are in the order (P-V). Pressure is in Nm-2 and volume is in litre.