Twin Impeller Shower Pump

indeed, and the electrical equivalent of the whale is the flying deck supplies, such as the old heater windings for the EHT rectifier valves  in the sort of black and white tellies I used to top up my pocket money by repairing. Half a dozen volts AC across the heater for the kathode, derived by a thickly insulated over-winding on the HT transformer, but flying around at several kV above the chassis (which itself was connected to the mains, not strictly earthed-  with a modern health and safety view it is amazing any of us lived to tell the tale, but you soon get used to working with one hand out of the way, when to forget the do not touch rule would carry the death penalty.)

The idea of a single reference 'ground' that is magically always at 0v is not always a useful one, it is perfectly fine to take your reference with you.


Thinking of the TVs, there are even more impressive things made where very delicate sensing electronics running off self contained supplies of  a few volts operates inside little metal boxes that bounce up and down by many tens of kV when pulsed power kit is fired, and so long as there is no penetration into the box, the violent change in the external potential is not 'visible' to the kit inside, and  it  is blissfully unaware of anything changing during the pulse. Equally, just leaving a couple of screws out can impair the screening such that it dies an EMP death immediately.

indeed, and the electrical equivalent of the whale is the flying deck supplies, such as the old heater windings for the EHT rectifier valves  in the sort of black and white tellies I used to top up my pocket money by repairing. Half a dozen volts AC across the heater for the kathode, derived by a thickly insulated over-winding on the HT transformer, but flying around at several kV above the chassis (which itself was connected to the mains, not strictly earthed-  with a modern health and safety view it is amazing any of us lived to tell the tale, but you soon get used to working with one hand out of the way, when to forget the do not touch rule would carry the death penalty.)

The idea of a single reference 'ground' that is magically always at 0v is not always a useful one, it is perfectly fine to take your reference with you.


Thinking of the TVs, there are even more impressive things made where very delicate sensing electronics running off self contained supplies of  a few volts operates inside little metal boxes that bounce up and down by many tens of kV when pulsed power kit is fired, and so long as there is no penetration into the box, the violent change in the external potential is not 'visible' to the kit inside, and  it  is blissfully unaware of anything changing during the pulse. Equally, just leaving a couple of screws out can impair the screening such that it dies an EMP death immediately.