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A power supply is an electrical device that supplies electric power to an electrical load. The main purpose of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power. Examples of the latter include power supplies found in desktop computers and consumer electronics devices. Other functions that power supplies may perform include limiting the current drawn by the load to safe levels, shutting off the current in the event of an electrical fault, power conditioning to prevent electronic noise or voltage surges on the input from reaching the load, power-factor correction, and storing energy so it can continue to power the load in the event of a temporary interruption in the source power (uninterruptible power supply).
All power supplies have a power input connection, which receives energy in the form of electric current from a source, and one or more power output or rail connections that deliver current to the load. The source power may come from the electric power grid, such as an electrical outlet, energy storage devices such as batteries or fuel cells, generators or alternators, solar power converters, or another power supply. The input and output are usually hardwired circuit connections, though some power supplies employ wireless energy transfer to power their loads without wired connections. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.

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  1. S

    does the power switch to the cylinder need to be left on ?

    Hello i have a 300l centre store unvented indirect cylinder. does the power need to be left on for this ? is it left on to keep water at temperature all day ? for a previous system i had a power switch for the immerison heater that was only turned on in an emergency thanks
  2. M

    How to fix power connector to boiler?

    Hey. Got home from Christmas with family to find boiler isn't working, no lights on anywhere. Boiler itself is old but ok. There has been a leak from an upstairs flat and the grey square connector in picture is very wet. Nothing has tripped on main board...I'm guessing either the connector...
  3. T

    power off no lights showing

    hi all , had a strange one this morning, boiler just went off ,dead no lights nothing. checked electric no power cuts everything else on in house, tools out then first checked power to spur , on, checked power from spur, on , switched off at spur removed cover to boiler (intergas 24/28) ,pulled...
  4. J

    Radiators top half hot & bottom half cold/warm---to do power flush?

    Hi all, I had my new boiler and 13 radiators installed in July last year, but since installed all the radiators always top half hot and bottom half cold or warm. I know that if radiators top half hot bottom half cold/warm, it indicates there's sludge in the system. But as the radiators were all...
  5. T

    Alpha boiler power cut

    Had a power cut now alpha gas saver 34c boiler is dead. Any ideas please
  6. CorgiDirect

    Kamco CF40 & CF90 Power Flush Machines Now In Stock !

    Kamco CF40 & CF90 Power Flush Machines Now in Stock! Due to Popular Demand. Order Today While Stock Lasts Power Flush Machines - CorgiDirect - https://corgi-direct.com/power-flush-machines-18089-0000
  7. R

    Using gas when power is off

    We recently had a power cut for 3 days and when it came back on I thought I would have a look at the smart meter. As expected I had 2 full days of no use of electricity. However when I went to look at my gas usage it looked almost normal usage during the whole period. Gas in my house only...
  8. GeoffG1

    Y plan provides HW & CH irrespective of request, turn of the power and

    I have replaced a danfoss timer /switch on a older system to a Drayton LP522 which consist of a hot water cylinder (heater not working) with a cylinder stat. A Honeywell y plan 3 port, a pump and a back boiler but no thermostat. I have checked and checked the wiring and all seems correct...
  9. N

    replacement model for a Redring Expressions 520TS power shower

    Hi chaps - can anyone recommend a replacement for the above? keeping it as simple as possible please....hot and cold inlets are on tight side as is the cable....cheers Dave
  10. P

    Power Flush after visit

    Hi I have recently had a visit from an engineer as I am covered under a homecare agreement I've had for around 18 years. This was for a leaky draincock valve. When I asked them to add inhibitor due to advice I received on this forum he said he would but then pulled out a pipe clogged with...
  11. R

    Electric power shower

    Could anybody advise me on which power shower to buy for a mains water fed low pressure system preferably with its own built in pump , not sure of the electric power in the 1 that’s in use at the minute , don’t mind paying for a really good power shower Many thanks
  12. G

    Can I disable the pump on a power shower?

    Hi, I have a Mira GoPower in a bathroom. I'm getting my system upgraded to unvented with an accuboost pumped cylinder. Whilst I am planning a bathroom refurb (new tiles, tray, enclosure, mixer etc), can I turn off the power element to the shower and use it as a straightforward mixer on a...
  13. T

    Chemical and/or Power Flush?

    Some more plumbing advice, please. I am getting a new boiler installed and this includes a Hot and Cold Chemical Flush of the system. Do I also need a Power Flush or is the Chemical Flush sufficient?
  14. C

    Weather cutting out Biassi and power flushing question

    Hi, would appreciate any thoughts/best suggestions with this. I have an 8 year old Biassi Riva Plus HE 28 Combi in the garage. Its had a few issues this past year but generally works well . Thinking of either fixing its existing 2 issues or replacing it with a new one. Prefer the former . The 2...
  15. G

    Power flush before blocked heat exchanger renewal ?

    Evening All We are having a new heat exchanger fitted to a Veissmann boiler, the boiler is only six months old, the installers carried out a power flush but only after the boiler had been running for about a fortnight, then after six months it failed to heat radiators to temperature. Viessmann...
  16. Riley

    Power in the van

    Hi guys looking at upgrading the van and am looking at putting some sort of inverter set up in place. Now I know nothing about these other than I know pure sine is less likely to damage whatever is plugged in. Does anyone have experience of these at all?? Literally JUST looking at it recharging...
  17. D

    Power shower outlet pipework

    Hi all, I'm about to replace the pump used for my power shower / bath filler. It's a Stuart-Turner Turbo 30T 3.0bar pump, 22mm inlet and outlet. The installation has been done so that the 22mm outlet reduces to 15mm pipework within less than a metre of the pump. I was thinking of...
  18. B

    Power Shower

    Hi all, is it possible to install a direct hot water storage tank system in the roof with a pump for a power shower to work independently form the combo boiler I currently have? Or is there some other way of doing it?
  19. B

    Potterton Performa 30HE hot water goes off - power cycling restores

    Hi I have a Potterton Performa 30HE in a one bedroom apartment. For a few months I have noticed that it takes several minutes before the taps to run hot. But last week they stopped running hot altogether. I have found that if I switch the electrical power to the boiler off and on again normal...
  20. M

    Airlock/low pressure power shower problem.

    Hi there, Our power shower has had very poor pressure for a long time, so I decided to bleed any air out of the system (which there was a lot). it works great to start with but gradudually the pressure falls and there is more air in the hot water system. I have done this about 6 times now, so I...
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