The sun

P/A at earth = 1350 W/m2 ; radius = 93 million miles = 1.49x1011m, so total power of sun, P = (P/A)*A = (1350 W/m2)*(4?)* (1.49x1011m)2 = 3.8x1026 W = 3.8x1026 Joules/sec.

“burning H into He”: 4H 1 He+24 MeV so 1 gram of H (1 mole) gives 24 MeV*(6x1023/4)* (1.6x10-13J/MeV)= 5.8x1011J/gram = 5.8x1014J/kg

sun must burn 3.8x1026J/sec / 5.8x1014J/kg = 6.6x1011kg/sec (660 million tons/sec).

P/A at earth = 1350 W/m2 ; radius = 93 million miles = 1.49x1011m, so total power of sun, P = (P/A)A = (1350 W/m2)(4?)* (1.49x1011m)2 = 3.8x1026 W = 3.8x1026 Joules/sec.