How did changing the speed to crank the generator affect the intensity and glow of light bulbs?

The bulb with get brighter. Power is equal to 2/
V
2
/
R
, so if you increase V and R at the same rate then power will increase. Note that with real incandescent light bulbs the resistance of the filament increases a lot from the bulb's "off" state to its "on" stage due to the fact that the resistance depends on temperature.