When we connect resistance to a dynamo/generator, why does it require more force to work?

Question

We notice this phenomenon when we increase the load on a genset too.

Answer 1

A rotating generator transforms a mechanical "energy" into an electrical "energy".
When the generator runs "free load", the mechanical energy is used only to rotate the generator.
When you load the generator, you need MORE mechanical energy to achieve the same results (you need the "off load" energy PLUS the amount of converted electical energy).
(plus some energy losses)

Answer 2

in this case,due to resistance, less amount of current flows through the output terminal.Therefore, to generate the required amount of current, more force is required. in case of increasing the load on genset, we connect more equipments, thereby increasing the nett resistance

Answer 3

when v connect more resistance naturally the voltage tends to drop. therefore to maintain the same voltage the dynamo(which is a small generator) needs more rotations resulting an increased level power.

Answer 4

when resistance is connected there is current in the winding. this winding is in a magnetic field and it creates a force in a direction opposite to the direction in which generator is rotated. So you need more "torque" to maintain the speed