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The bipolar transistor dissipates minimum power when it is

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Consider this simple CircuitLab sketch of a circuit (a current source):

circuit

I'm not sure how to calculate the power dissipation across the transistor.

I'm taking a class in electronics and have the following equation in my notes (not sure if it helps):

=++−

So the power dissipation is the power dissipation across the collector and emitter, the power dissipation across the base and emitter and a mystery factor −. Note that the β of the transistor in this example was set to 50.

I'm quite confused overall and the many questions here on transistors have been very helpful.