Why is it more difficult to turn the crank when either another genecon or light bulb is attached?

Turning the crank becomes more difficult when another genecon or light bulb is attached because the additional load increases the electrical resistance in the circuit. This requires more effort to generate the same amount of electricity, as the crank must overcome both the mechanical resistance of the load and the electrical demand of the connected devices. Consequently, the increased energy output needed to power multiple devices makes the task physically harder.