<Dl> <Dd> u = 1 2 (E ⋅ D + B ⋅ H), (\ displaystyle u = (\ frac (1) (2)) \! \ left (\ mathbf (E) \ cdot \ mathbf (D) + \ mathbf (B) \ cdot \ mathbf (H) \ right) \!,) </Dd> </Dl> <Dd> u = 1 2 (E ⋅ D + B ⋅ H), (\ displaystyle u = (\ frac (1) (2)) \! \ left (\ mathbf (E) \ cdot \ mathbf (D) + \ mathbf (B) \ cdot \ mathbf (H) \ right) \!,) </Dd> <Ul> <Li> E is the electric field; </Li> <Li> D is the electric displacement field; </Li> <Li> B is the magnetic field; </Li> <Li> H is the magnetic auxiliary field . </Li> </Ul> <Li> E is the electric field; </Li>

The average magnitude of the poynting vector is also known as intensity