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At least my oppinion without any garantuee: There can be a negative efficiency for example in the case of induction motors driver by inverter and FOC in generator mode. Since you have an induction motors you always have to provide some power in order to magnetize the rotor. The current which magnetizes the rotor causes losses. So there could be some working points where the losses caused due to the magnetization are bigger than the power generated (the negative torque taken away from the rotor).

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Percentage of work in to work out?

I think it is efficiency.;)


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What is efficiency of a simple machine?

Efficiency % = (work out / work in) * 100 (Work = force * distance)


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To find the work out, you can use the formula for efficiency: Efficiency = (Work out / Work in) * 100. Given that the efficiency is 95%, you can rearrange the formula to find Work out as follows: Work out = (Efficiency / 100) * Work in. Substituting the values, you get Work out = (0.95) * 95 J = 90.25 J.


What is a percentage of work in to work out?

efficiency


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