Here are the final two pathways in which you might find power.
Whenever power is shifted by photons being emitted or absorbed, expect to find a hearting by radiation pathway: the pathway is heating by radiation
.
Both the number each second(the activity) and energy per photon(set by the frequency) set the power in the heating by radiation pathway. So you can get a high power either by choosing a high frequency or a big activity—there is a trade-off.
Whenever power is shifted by warm matter (with particles that are moving randomly) travelling, expect to find a hearting by particles pathway: the pathway is heating by particles
.
Both the number each second(the activity) and energy per particle(set by the speed) set the power in the heating by particles pathway. So you can get a high power either by choosing a high activity or a large energy per particle—there is a trade-off.