constant power load

[TGS78]

For my simulation I need a constant 15W power load (nothing complex, just a resistive load).
LTSpice has a PLoad Model for that, is there something similar in CircuitJS?

[pfalstad]

Here is a VCCS configured as a 15W power load

https://tinyurl.com/26hlkjvq

If the resistor is too large (more than about 40 ohms) then it will fluctuate, because there's no way to get the power that high.