All Questions
13
questions
0
votes
1
answer
79
views
Does AC wire ampere rating depend on end DC load current pull? [closed]
So between my 220V 50Hz AC source and my 12V 5-10Amps DC load I have placed a SMPS power supply which converts 220V AC to 12V DC and is rated to supply 16Amps. Now my cable to connect the 220V AC with ...
- 532
2
votes
1
answer
785
views
Multiple AC-DC power supplies: one direct AC wall plug or two?
I'm building a data acquisition system that needs to power sensors and a high voltage contactor at 24Vdc, 12Vdc, and 5Vdc. After reading another post, it seems it is best to use separate AC-DC power ...
- 21
0
votes
2
answers
250
views
How do I calculate current when using a power supply?
Edit:
I’ve just learned that a 500mA PSU is not going to necessarily output 500mA; it’s not a constant current PSU. It CAN output that much, but only if its components are asking for that much. It ...
0
votes
1
answer
129
views
AC to DC power calculations? [closed]
I have an ac to dc power supply and it measures at 244.0Vac on the primary side and the secondary side it is reading 21.34Vdc. I attached a load to the secondary side that is drawing 0.390amps and ...
- 1
0
votes
1
answer
209
views
Inverter resistance and calculation confusion
I'm using a 1200W pure sine wave inverter and a series of extension cords to power devices in a mobile home. When charging my laptop, I noticed it was charging slowly. According to my battery ...
- 1
0
votes
0
answers
121
views
DC Coaxial Power Connector Rated for 20A
I have a 12V 20A power adapter seen here (https://www.ledwholesalers.com/v2/index.php?route=product/product&path=40_117&product_id=999). I would like to connect to this power supply, but my ...
- 1
0
votes
4
answers
98
views
Movement of electron in ac current
Movement of electron direction in ac current is continuously changing which leads to more collision of electrons then dc current.From this can we conclude that ac current heated the wire more than dc ...
0
votes
0
answers
26
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Converting 110V AC to 12V DC [duplicate]
I am currently moving to a location for work that has a 110v electrical connection but no water connection. I was attempting to use an RV water pump in order to create a plumbing system for my sink ...
0
votes
3
answers
2k
views
Can I quickly charge supercapacitors with a power adapter?
I am trying to make a super capacitor bank that I can charge is a couple minutes. It will output a 5V USB charge (aka a power bank.)
My materials: a 15V 8A power adapter, 2 Maxwell 2.7V 3000F ...
1
vote
2
answers
929
views
How to plan my LED circuit, voltage, and resistor
The LED emitters in my outdoor lamps blew out and I need to replace them but I have to rebuild the emitter from scratch because replacement parts are not available. The whole lamp was made in China. ...
1
vote
0
answers
67
views
Why do some Arduino relay modules can handle up to 250 VAC but not above 30 VDC? [duplicate]
When you look for "Arduino relay module"s, you usually see one form "SONGLE" that says on it:
10A 250 VAC 10A 125 VAC
10A 30 VDC 10A 28 VDC
My question:...
- 426
2
votes
2
answers
520
views
Replace transformer with PWM control
This is my first question on stackexchange so if I do anything wrong, please let me know :-)
So my situation is the following:
I am working on a power supply module where I need 7 separated +28V DC ...
- 23
0
votes
1
answer
673
views
Relay that detects 240VAC and switches 12V DC
I'm wishing to detect the loss of AC power (in this case 240V) and when this event occurs have a 12V DC circuit go to earth. This will trigger an alarm for users to react to situation.
Can anyone ...
