1. In terms of a studio flash unit, is there a difference between a generator and a power pack?
The difference with a monoblock or monolight flash units is that they have to be plugged into the mains and the 'generator' is housed in the head of the unit where as the power pack can be attached to the mains or can be taken to a site without power and used. Most websites I researched considered them to be the same thing.
2. What is the unit or units of measurements that describes a studio flash output level?
Watt-Seconds (W/s) or Joules (J).
3. What is the difference between symmetrical and asymmetrical flash power output?
Symmetrical - power adjustment to one channel affects ALL channels similarly.
Asymmetrical - ability to adjust one channel without affecting the other.
4. What is a modelling light and how is it used in practice?
A constant light when turned on to give an indication of the effect that the flash will have. Doesn't affect actual exposure. Some flash head modelling lights only have full power while others are adjustable.
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