Since version 2026, Flux 3D and Flux PEEC are no longer available.
Please use SimLab to create a new 3D project or to import an existing Flux 3D project.
Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).
/!\ Documentation updates are in progress – some mentions of 3D may still appear.
Power and energy; definitions and reminders
Power / Energy
In physics, power is the quantity of energy per unit of time supplied by the studied system to another system; therefore, the power corresponds to the time variation of energy. Two systems of different power can deliver the same energy, but the more powerful system will deliver this energy faster, in a smaller time interval.
Power is always equal to the product of an effort quantity (force, torque, pressure, tension, etc.) by a flux quantity (linear velocity, angular velocity, flow, current intensity, etc).
Instantaneous power/ mean power
The mean power Pm characterizing a process is the ratio between the supplied energy or delivered energy W during the process duration T and this duration, respectively: Pm = W/T
The instantaneous power P(t) is the derivative of time variation of the supplied or delivered energy W(t) with respect to time, respectively: P(t)=dW/dt