do, rev 0 T T FIGURE 20-11 Any reversible cycle can be approximated as a series of carnot cycles (The dashed lines represent isotherms.) (Q1T1+Q22)+(-Q2T2+Q33)+…+(-Q6T6+Q7T7)=0 = 0 T dQrev T1 T2 T3 T4 T5 T6 T7 (Q1 / T1+Q2 /T2 )+(-Q2 /T2 +Q3 /T3 )+…+ (-Q6 /T6 +Q7 /T7 )=0