According to what parameters of the hydraulic cylinder, what formula can be used to calculate the motor power that drives the piston movement For example, please describe the formula and process in detail,

According to what parameters of the hydraulic cylinder, what formula can be used to calculate the motor power that drives the piston movement For example, please describe the formula and process in detail,

1. The formula is: P = f * V / η P --- motor power unit kwf --- hydraulic cylinder thrust unit NV --- hydraulic cylinder moving speed unit m η --- total efficiency of hydraulic system 0.9-0.98 left right

The essence of work is the mutual conversion between internal energy and mechanical energy
How to understand, for example, can not be limited to friction

This sentence has its limitations!
It should be said that the essence of work is the mutual transformation between different energies, not necessarily the transformation between internal energy and mechanical energy
When electric current flows through the rice cooker, electric energy is converted into heat
When current flows through the electric fan, electrical energy is converted into mechanical energy (and heat)
When a tire is inflated with a pump, the chemical energy of a person is converted into heat (or the internal energy of the air)

The mechanical energy generated by current passing through a certain electrical appliance is 9000j, the heat generated is 3000j, what is the work done by current
Electricity is in a mess

Mechanical energy and heat are one kind of energy. Heat is a waste, maybe friction and so on, so a total of 9000 + 3000 = 12000 joules are produced

If the light energy is 50J and the internal energy is 100J, the mechanical energy is [] J

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