A Promethean Thought Experiment

[IggyZ]

@Floor.
Looks very interesting.
I have no doubt the pdf file ("Magnets Motion and Measurement") attached to your post will be very useful indeed!
Thanks!

[IggyZ]

Seen on the Internet:"The maximum output electrical power of a generator is equal to the maximum input mechanical times the generator efficiency. Typically for a commercial generator, that is in the order of 95%. So 1 kW of mechanical input power yields 0,95 kW of electrical output power."

Is this the correct wat to calculate the efficiency of a generator?

If it is not  correct I would very much appreciate the correct formula with an example and explanation a lay person can understand.

[bistander]

Seen on the Internet:"The maximum output electrical power of a generator is equal to the maximum input mechanical times the generator efficiency. Typically for a commercial generator, that is in the order of 95%. So 1 kW of mechanical input power yields 0,95 kW of electrical output power."

Is this the correct wat to calculate the efficiency of a generator?

If it is not  correct I would very much appreciate the correct formula with an example and explanation a lay person can understand.

Hi IggyZ,
Efficiency of a power conversion device is defined as useful power output divided by total power input times 100%.
So if your generator delivers 0.95kW output of real power electrical using 1.0kW of mechanical power input, then it is 95% efficient at that operating point. Fact. By definition. That operating point may, or may not be maximum power. That depends on the actual machine design. Generators can, and do, operate at various loads, or operating points. Typically the generator nameplate will state its rated load, which is seldom its maximum power output. The generator can operate at no-load, partial load, full (or rated) load, overload, or maximum power output load. Efficiency is typically different for every operating point. Decent generator design will have peak efficiency normally somewhat less than full rated load, but efficiency at rated load will be close to max efficiency. Efficiency at maximum power output is typically well below maximum efficiency.
Hope that helps.
bi

[Tarsier_79]

https://www.youtube.com/watch?v=sENgdSF8ppA&t=1s

This is the reason all the multi-coil OU generators here don't actually create OU. It is also the reason your large radius rotor will not. When your magnet creates voltage and current in your generator, the equvalent force is transferred to the magnet. What you do to the back-emf also affects the magnet.

Electrical current x voltage is power. Power in - frictions -inefficiency = power out.

Even so, I would love to see your generator..

[IggyZ]

Thank you bistander, it really was helpful.