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Yes, you can run a 4.3v device with a 5v power adapter as long as the amperage of the 4.3 volt device is under the amperage capacity of the 5 volt adapter.
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Can a 5 volt. 1500 ma. power adapter be used to run a 4.5 volt appliance?
No, get a matching transformer and check the polarity and the milliamps.
Can a laptop 65 watt ac adapter be replace with a 90 watt ac adpter both output 19.5 v?
Yes, you can replace a 65 watt AC adapter with a 90 watt AC adapter as long as the voltage output matches (19.5 V). The laptop will only draw the amount of power it needs, so the higher wattage of the adapter won't cause any harm. However, it is always recommended to use the adapter that is specifically designed for your laptop model to ensure compatibility and avoid potential issues.
For a device requiring DC 12V 2Amps will a DC adapter output 12V 1000ma also work for this device?
Assuming the plug fits, and that the polarity is correct it'll work fine. Drawing less amps than the source can deliver isn't a problem, it'd be a bit like filling a glass from a pitcher. Drawing more amps than the source can deliver is what you need to watch out for, that can cause overheating and all sorts of nasty failures.
Can you use a 12V 300mA on a device that require 12V 1.0A?
You might be able to, but you probably *shouldn't*. 1 amp is equal to 1000 mA. The device requiring 1.0A is listing the maximum amount of amps that the device will need from it's power supply. If it only delivers 300 mA, there's a chance it may still run, but it could exceed the current needed to run the device (which could shorten it's life, or burn it out immediately in the worst case scenario). I currently am using a 12v 500mA supply with a light-based device requiring 12v 1A, and while it does work, the source device (an adapter) gets extremely hot and could be a fire hazard. Stick with the recommended matching specs, or if you can't match, even 12V2.0A would be safer and preferred.
Can you use a 1200 amp adapter for 500 amp appliance?
Yes, the adaptor allows load currents of 1200 amps or less, and 500 amps is included in that. The voltage of a supply stays constant, the current that flows is determined by what power the appliance needs to run.
Will a 5V 2.5A adapter damage a device that requires a 6V 2A adapter?
No, underpowering will not "power" the device, it will not run. You must get an adapter that is 6V and (2A or higher) will be ok as well.
Can you use a 9 volt dc adapter to power a device that calls for 10 volts dc?
Yes. However, the device me not run at its optimum capacity/speed. Other thing to take into consideration is that the polarity (+/-) of adapter and the receiving device must match.
Laptop will not run with power cord only and when battery is in and charging screen will not light up?
Your power adapter has failed, or power adapter connector failed, or charging circuit failed.
Can a DC 9v 100MA device use 9v 650MA adaptor?
sure, no problem! The power supplying device is rated as to its MAXIMUM current delivering capacity, so 100ma being less than 650ma, you could run up to 6 of those devices in parallel with that adapter. You should not try to run a 650ma device with a 100ma supply though.
Will a device requiring AC DC 9V 1000mA work with an adapter that provides 1250mA?
Yes, an adaptor with a capacity of 1250 mA's will run devices that are rated up to and including 1250 mA. Always check that the voltage from the adapter matches the device.
Can a device requiring 12 volts and 3 amps run with an adapter providing 12 volts and 2 amps?
No. Your power supply must be able to supply rated voltage (12 volts) and rated current (3 amps).
Can you use replace 5V 3.6A ac adapter to 5V 2.6A ac adapter?
Well, trying to clarify your question, if you have a device that normally has a 5V 3.6A adapter, than it likely needs to be able to draw up to 3.6 amps or so for the device to operate normally. So, a 5V 2.6 amp adapter may operate at times, but only when the device is trying to draw less than 2.6 amps. If the device tries to draw more than 2.6 amps than you run the chance of burning out your transformer (the AC adapter), or just not having your device work. Both adapters will put out the 5 volts, but the 2.6 amp adapter will not provide enough current. You can safely use a larger adapter than the 3.6A, as your device will only draw as much current at 5 volts as it needs. On another note, do not try an adapter that puts out the same current but more voltage. Such as 7.5 volts 3.6 amps. This will overdrive your device and potentially burn it out.
If the output current is 3.9A on a 19.5V ac adapter can this adapter be replaced with a new ac adapter with an output of 4.7A current on a 19.5V adapter?
Don't count on it. Your 18 watt device should be matched with the proper AC adapter. You cannot rely on the device to resist and limit a supply voltage more than 50% beyond its rated capacity. You wouldn't try to run a 110 volt electric shaver from a 220 volt receptacle, would you? If you try to purchase a fixed or universal (adjustable voltage) adapter you must also be concerned to match the polarity where the two meet. Some electronic devices are sensitive to mismatched polarity and will fail. Your best bet is to contact the manufacturer of the device to purchase a replacement ac adapter. outside of improper polarity (assuming dc here, ac doesn't matter), if the VOLTAGE OUTPUT of the adaptor matches the INPUT VOLTAGE of the device it is powering, all is ok. as long as the current (milliampre rating) of the adaptor is equal to or exceeds the current rating of the device, all is ok. wattage is equal to voltage X amperes ... hence one cannot use the wattage rating of an ac adaptor to determine if it is is correct to use on a given device. Perhaps. If the two devices accept the same range of voltages, the polarity is correct (although AC circuits do not care about polarity, reversed polarity is a serious safety hazard), and the power adapter to be used can provide at least the amount of current required by the device in question, then yes. If the adapter is not rated to sufficient current, the device may or may not function -- the current will still be provided, but the supply voltage will drop. The power supply will generate additional heat. A voltage mismatch may destroy the device. Mismatched polarity for a device requiring DC power will not work and may damage the device. Mismatched polarity for a device requiring AC power will work, but may present a shock hazard, as many cases are connected to the neutral wire. Reversing the polarity will cause the case to be wired to 120V.
Can you use a 5V 350ma adapter to power a 4 port usb hub?
Always use the correct power adapter for your devices. Doing otherwise can and might just break or short out your device. Technically speaking that will not likely provide enough power to run a USB hub. Each of the USB ports on a powered hub must be capable of providing up to 500ma of power. So usually you'll see a 5volt 2amp or something akin to that. Many electronics store will sell a variable output power supply which allows you to set the plug and power rating on the supply to fit your needs. The hub/device will USUALLY have a list of the input power required. Hope that helps!
Can you use a 12V 150mA adapter on a device that requires DC 12 V at 1 A?
As long as the current output is greater than power supply it replaces it will work fine. If the replacement is rated for less current (amperes) than the original you don't want to use it. Of course a DC supply has to be replaced with a DC power supply. AC with an AC supply. The polarity should be the same and the voltage should be the same and the pin and barrel should be the same diameter as well.
What is fuction of power supply?
The power supply makes the computer run, without any type of power supply it would be impossible to run a computer. The mains power supply for a laptop and the power supply unit of a desk top, both convert the high AC voltage from the mains power and convert it to low voltage DC, for the electronics of a computer to use.
Can you use a 9v 300mA adapter on a device that requires a 9v 400mA adapter?
No. The voltage rating is the same, but the lower current rating on the 400ma power supply might cause the voltage to drop way below 12 volts, and on some devices a lower voltage than it is rated for will cause it damage.
