If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
A
$${\text{H}} = \frac{{{\text{Hg}}}}{{{\text{hf}}}}$$
B
H = Hg × hf
C
H = Hg + hf
D
H = Hg - hf
Correct Answer: H = Hg - hf