It’s not that it needs more power. It’s that it is required to operate at a higher temperature in order to bring the ceramic to a temperature needed to vaporize the juice. The wire does not vaporize the juice, the ceramic does.
The wire is nothing more than ~60mm of 29awg SS316L – this alone is the equivalent of a 3mm ID 5 wrap coil of the same gauge which can be vaped at as low as 8ish watts. But you require 20 to 30 watts for the wire to heat the ceramic in order to produce vapor. By using the correct TCR value for the wire, we can get a good idea of what temperature the wire is operating at. But if your goal is to control the temperature, what is the temperature of the ceramic?
One of the objectives of Temp Control is to scale back power as your wick starts to dry in order to mitigate dry burns. In a typical coil/cotton config, your coil still hit’s your prescribed temperature. But the cooling effect of the juice, or lack of, dictates how much power is needed to reach that prescribed temperature.
With the attached example, coil temperature is indicated in red, the applied power in green. Subject A is a fully saturated Fused Clapton. Power is consistent and does not change. You can even see how it struggles to reach the prescribed temperature because of the cooling effect the juice has. Subject B is the same Fused Clapton as the wick is drying out. It hits the prescribed temp for a very brief moment then immediately scaled back.
Subject C is a CCell with a full tank of juice. Subject D is the same CCell in an empty tank with about 3 to 4 dry hits prior to plotting this graph. C and D are identical. Technically they should plot in the same fashion as A and B. But the power does not change because the wire is not influenced by how saturated the ceramic is. You do see it scale back but any bare wire will do the same.