# Kinetic to Electric Power Conversion

 P: 12 When you say the generator will only put out as much power as is demanded of it, that's surely only when the generator as a unit is fitted with sensors to detect when it's current output is insufficient or excessive to the demand? If the IC engine is being given varying power demands by the driver, how does that translate into what the generator gives out in amperage? So, if the load on the wheels and the motor stays the same, but the driver demands more power from the engine... what will change? I presume the amp output of the generator would increase... so would the speed of the wheels change?
P: 589
 Quote by RoSmith When you say the generator will only put out as much power as is demanded of it, that's surely only when the generator as a unit is fitted with sensors to detect when it's current output is insufficient or excessive to the demand? If the IC engine is being given varying power demands by the driver, how does that translate into what the generator gives out in amperage? So, if the load on the wheels and the motor stays the same, but the driver demands more power from the engine... what will change? I presume the amp output of the generator would increase... so would the speed of the wheels change?
A common misconception is that a generator or alternator always outputs its maximum amperage (at a given RPM) all of the time. Current only flows if there is a load, and the amount of current varies with the load (for the same voltage).

This says it better than I can -- http://www.generatorguide.net/howgeneratorworks.html :
"If an external circuit is connected to the coil's terminals, this voltage will create current through this circuit, resulting in energy being delivered to the load. Note that the load current in turn creates a magnetic field that opposes the change in the flux of the coil, so the coil opposes the motion. The higher current, the larger force must be applied to the armature to keep it from slowing down."
Many other examples can be found around the 'net. http://www.google.com/search?q=elect...nerator+basics

As for formulas, there are many, depending on the specific question.