Twin Impeller Shower Pump

mapj1:

That post reminds me that It has often amused me that in many textbooks an introduction to electrical theory  is 'simplified' by considering it to be like some closed circuit plumbing with pumps and things.

This simplification is at odds with real plumbing that has some really nasty gotchas, like air locks, gravity circulation by convection, non-linear resistances in the form of pressure drop nothing like proportional to flow,  transmission line resonance effects  like water hammer etc .

In many ways I have often wondered if it might be easier the other way about and to 'simplify' the explanation of the principles of plumbing by pretending it is like electrics... so we can say things like "these radiators are like resistors in parallel across the boiler"

You may have as many radiators in parallel as you like, but let's keep it simple and have one.


One volt, one ohm, one amp. Now let's increase the resistance. One volt, one kilohm, one milliamp.


But ...


One meter head of pressure, one radiator two metres above, and no flow at all.


So which animal has the highest blood pressure?

mapj1:

That post reminds me that It has often amused me that in many textbooks an introduction to electrical theory  is 'simplified' by considering it to be like some closed circuit plumbing with pumps and things.

This simplification is at odds with real plumbing that has some really nasty gotchas, like air locks, gravity circulation by convection, non-linear resistances in the form of pressure drop nothing like proportional to flow,  transmission line resonance effects  like water hammer etc .

In many ways I have often wondered if it might be easier the other way about and to 'simplify' the explanation of the principles of plumbing by pretending it is like electrics... so we can say things like "these radiators are like resistors in parallel across the boiler"

You may have as many radiators in parallel as you like, but let's keep it simple and have one.


One volt, one ohm, one amp. Now let's increase the resistance. One volt, one kilohm, one milliamp.


But ...


One meter head of pressure, one radiator two metres above, and no flow at all.


So which animal has the highest blood pressure?