In the water analogy, the pressure is higher before a resistor (restriction)
than after it, just like a voltage drop. But does that mean that the density of
water is higher before the restriction than after it? It seems logical, but
I've heard of the "incompressibility" of water and am wondering what that
means (and if its just an ideal). In the water analogies, they sometimes talk
of "mass flow rate" and sometimes of "volume flow rate". I guess if water is
"incompressible" in the sense that it's mass density does not change under
pressure changes, then these two kinds of flow rate would be equivalent.
Reading:
http://en.wikipedia.org/wiki/Hydraulic_analogy
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir.html
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir2.html
than after it, just like a voltage drop. But does that mean that the density of
water is higher before the restriction than after it? It seems logical, but
I've heard of the "incompressibility" of water and am wondering what that
means (and if its just an ideal). In the water analogies, they sometimes talk
of "mass flow rate" and sometimes of "volume flow rate". I guess if water is
"incompressible" in the sense that it's mass density does not change under
pressure changes, then these two kinds of flow rate would be equivalent.
Reading:
http://en.wikipedia.org/wiki/Hydraulic_analogy
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir.html
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir2.html