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Which device converts 120volt ac from what if your wall to 12vdc for your computer to use?
Wiki User
∙ 11y ago
power supply
Wiki User
∙ 11y ago
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How do you reduce 100Vdc to multiple outputs of 12vdc 24vdc and 48vdc?
I wish I had the perfect answer for you because it's actually a very interesting question. Typical responses might include using DC regulators that cannot handle your input voltage, or perhaps Zenier diodes to clamp the voltage down. Neither is a good solution. What you're trying to achieve has been done for many years in VCR's, TV's, and many new digital appliances. They are faced with a somewhat similar dilemma to you in that they have 120 volts AC (here in the US) and they need to reduce it down to some common levels such as +12 volts, -12 volts, and/or +5 volts. Here's how they do it: First, they recognize the uselessness (due to inefficiency and heat generated of just using a step-down transformer) by converting the 120 volts AC to DC (believe it or not) with a bridge rectifier. It is also filtered a bit with capacitors and perhaps even clamped a bit with a Zener diode. The new 120 volts DC is then fed to an oscillator circuit which drives a high-powered switching device (a transistor for example) into their own custom-made transformer. The output taps for the transformer are wound proportionally to achieve the desired voltage. Next, each output is rectified (because it's AC) to DC, filtered with a capacitor, perhaps regulated (with a regulator like an LM7812 for 12 volts). The now have their desired output voltages. Constructing such DC-to-DC converter would be pretty much impossible unless you plan on hiring an engineer to design it and expect to make millions selling it. Yea, I know this doesn't answer your question, but that is how it's done in the "real" world. Note that you can't use an LM317 voltage regulator because your input voltage exceeds the maximum of the device. Perhaps someone else will know of a regulator than can handle 100 volts, but I don't know of one. I would search the 'net for DC to DC inverters and see what you find. I haven't done any searching myself, so you may find nothing. As an interesting aside, why 48vdc? Are you building your own Telco switch? ;-) <><><> In many circuits, a voltage-dropping resistor or resistors are used for this function. This will work if the need is for a bias or voltage level (and not to supply power). You need to know the current to calculate the proper resistor value from Ohm's law, and also make sure the resistor can dissipate the power (heat) that may be generated.
How do you determine a resistor's wattage?
The physical size of the resistor determines how much power(wattage), or heat can be dissipated. The larger the resistor the more power it can dissipate. Resistance is the opposition to current flow(electrons) and this opposition causes heat to be generated when current flows through it. The AMOUNT of Heat dissipated per unit of time is measured in watts. example if P=I X E (power formula) P=Power(watts) E=Voltage I=Current ohm's law-->E=I X R say you are using a 1/2 w 100 ohm resistor and you put 12VDC thru the resistor to ground. determine the current: I=E/R I=12V/100 ohms I=120 ma. Plug in value into ohms law formula. P=I X E P=.120 x 12 P=1.44 watts (resistor will be dissipating 1.44 watts at 12v with 120 milli amps flowing thru it. Resistors come in different wattage values( 1/8w, 1/4w, 1/2w, 1w etc) usually printed on them. So for this case you would need at least a 2 WATT resistor and still be safe and NOT BURN and destroy it to a crisp. If the resistance has not changed then your resistor passed the required safe amount of current. If the resistance has changed you may have burned the resistor with too much current and thus you have overpowered it. You can also use a wattmeter and measure the wattage as voltage and current is applied to the resistor at a given resistance.
Can you use a 12VDC 500 mA on a unit that asks for 12VDC 1amp?
No you can not use this power supply 12 V DC 500 ma instead 12VDC 1amp because this battery will not able to deliver sufficient power to that device which you want to power it from this battery and your device will not work fine or it will work with very poor performance.
Can you use 12VDC in New Zealand?
Almost all cars in NZ have 12VDC electrics. Most portable generators which produce 230VAC, will also have a 12VDC accessory output for battery charging, etc. There are no general reticulations of 12VDC.
How can i make a winding of a transformer of an inverter of 12vDC to 240vAc?
850va 12vdc inverter transformer praemari tans
How do you produce 12V adapter?
From what? If you need 12VDC for temporary use, there is a very good 12VDC source in your PC power supply.
Location of computer power supply in motherboard?
The power supply is usually always located at the top of the computer tower, to the back. Whats easy to find is whatever your power cord from the wall plugs into on the back of your computer, is your power supply box. From there, the power is reduced and sent throughout the computers hardware. (You'll also see that its the box with all the wires are coming out of, inside the computer)
Can you plug in a 12 vdc fan to house current outlet?
If you do it will burn the winding immediately and make the fan inoperable. So, No, don't plug in ANY 12VDC device into a 120 outlet.
What is the voltage at car ac compressor?
Most all are 12vdc
How many batteries are in a Voltswagen golf GTI?
One. 12VDC 54AH.
What does 12vdc power mean?
It stands for "12 volts, direct current".
How do you if you have a 12vdc or 24 deep cycle battery?
It should be marked on the battery.
How do you check the fuel solenoid on Briggs 18 hp ohv engine?
Switch the ignition to on. Put your meter to 12VDc. Touch the hot wire going to the solenoid with the meter positive probe . Touch the meter negative probe to ground. If you have 12VDc and you don't hear a click when you turn on the switch, the solenoid is probably bad. If you don't have 12VDc, check fuses and the wire going to the solenoid.
How do you wire 12V AC to 120V DC?
You would need a 12VDC to 120VAC power supply.
