Some authors distinguish between a natural experiment and a quasi-experiment. The difference is that in a quasi-experiment the criterion for assignment is selected by the researcher, while in a natural experiment the assignment occurs 'naturally,' without the researcher's intervention. Quasi-experiments have outcome measures, treatments, and experimental units, but do not use random assignment.
Simple Electrical Circuit with a Bulb, some Wire and a Battery. A guide to the basics of electricity. Here is everything you need to know about electrical power (Watts), current (Amps) and voltage (Volts), how to understand simple electricity and the way these parameters relate to one another. Lets begin with some simple definitions:
If we know the precise amount of electricity flowing per second through a wire (the Amperes,) this tells us nothing about the amount of energy being delivered per second into a light bulb (the Watts.) Amperes are not Watts, an electric current is not a flow of energy; they are two different things.