what does increasing the load mean
Load is a term for how hard the device has to work to power whatever is attached to it. High load means the output power is high, low load means the output power is low. You can increase the load by, say, connecting a second device to the output of the generator. Assuming the voltage is constant, the current will be higher (since there are now two deices powered by the generator). That means that the equivalent resistance of both deices in parallel will be lower than that of a single device. So, increasing the load means decreasing the resistance of the load. This may be counter intuitive, but usually devices are not rated in resistance-they are rated in input current or power, so the load follows that.