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AL2006
Since the 2-watt jobber has to dissipate twice as much power as the smaller unit I would expect it to have double the surface area. So if they are the usual cylindrical striped resistors then the larger one could have either double the length or else 1.4 times the radius of the smaller one.

Carbon resistor?

Carbon resistors are resistors composed of tiny carbon fragments with a binder in a cylindrical shape and baked with terminal lead

Of course the larger the size of the resistor, the greater the surface area of heat dissipation. So, the approximate increase from a 1w to a 2w carbon resistor implies that that the 2w resistor doubles the the increase in size from a 1 w to a 2w carbon resistor? of 1w

Learn more about carbon resistors:

https://brainly.com/question/9612903