A friend has been talking to me about using various electric generators in order to create a perpetuum mobile that can be used for various especially in cars. Of course I instantly said that it doesn't work and mentioned the following reasons that I think contradict his claim that it must work:
- Assuming the generator is based on induction to generate electricity I said that most likely the conductors will inherently heat up which is a loss of power.
- Furthermore the generated current will adhere to Lenz's law and I assume the magnetic field induced by the generated current might cause loss of power as well.
- Ultimately the rotor in such a system will not be frictionless and cause heat as well.
Unfortunately though, my friend still insists on his idea and boldly mentioned the following things:
- He claims that he has seen an electric generator that is being sold that an be plugged into the wall socket and that consumes $x$ kW and generates $y$ kW where $x<y$.
- He thinks it must be possible somehow to use a fuel based generator in order to power an electric car since it takes $x$ hours to power the battery while the fuel based generator can power the battery in less time thus generating more current/power than inserted into it.
For the first bullet I am actually struggling to believe him since I don't see any reason why I would like to plug something into the socket in order to get current that I would have gotten without the generator in the first place.
Nonetheless, I am looking for futher proof why it must be impossible to have such a generator.