Sentence:  In free burning electric arcs , for instance , approximately 90 % of the total arc <WSD>power</WSD> is transferred to the anode giving rise to local heat fluxes in excess of **f as measured by the authors - the exact value depending on the arc atmosphere . 
Meaning of the word marked with <WSD> tags:  (physics) the rate of doing work; measured in watts (= joules/second)