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The answer is a very-qualified "yes."
Assuming that you buffer the output (see below), any value potentiometer can be used to get 9V from 12V. Assuming a round, linear taper pot (see below), you will get 9V at the tap when you turn the knob approximately 1/4 of the way from maximum output.
A potentiometer (or "pot") is a 3 terminal device consisting of two "fixed contacts" at the ends of a (typically) wire-wound resistor and one "wiper contact" or "tap" that can be moved along the resistor.
If you apply a 12V source to the fixed contacts of a potentiometer, you will be able to adjust the tap to any voltage between 12V and 0V. In many applications, the tap serves as a reference value. This means that you don't load the tap directly but instead buffer it using an amplification stage to drive your load. If you apply the load directly to the tap, it will change the voltage value and generally make your design more complicated. In cases where the load is tied directly to the tap, the pot is often wired differently in a configuration called a rheostat.
When you choose your potentiometer, there are a few parameters you want to pay attention to:
1. The value of the potentiometer (e.g. 1K ohms) is the value of the resistance between the fixed contacts when the tap is left open. This value is important because it usually determines the amount of current drawn from the source. If you're replacing a potentiometer that has burned out, make sure to match this value with the one you're removing.
2. The power rating of the potentiometer (e.g. 0.5W) is how much power the potentiometer can dissipate safely. Make sure that the power rating is high enough for your application or it will burn out.
3. The taper of the potentiometer (e.g. linear or logarithmic) describes how the position of the tap changes with travel. Audio applications typically use a logarithmic potentiometer because our ears distinguish sound intensity logarithmically (something that sounds "twice as loud" is probably causing several powers of ten times as much energy to strike your eardrum). If you get the wrong taper, adjusting the potentiometer will feel "wrong" and either the change will be too great or not noticeable for most of the travel.
What else can I help you with?
What is meaning of 9v-0-9v transformer?
It is kind of transformers called center-tap transformer its main function is to transform primary voltage to 2 secondary voltages or vice versa. In your statement the transformer will convert the input voltage to 2 voltage each is 9v or the opposite it will convert the 2 input voltages with each 9v to a certain value depending on the turns ratio of the transformer.
Can a 9v dc motor produce 9v when it is used as an alternator?
A: No problem but don't expect the power to increase
What would be the voltage drop across two 25 resistors in parallel if the source voltage were equal to 9v?
The voltage would 9V minus any drop in the battery.
What is 9 volts across a 300 ohm resistor?
9v
What happens if i use a 12v Dc in a device that requires 9v DC And can it be repaired?
Not a good idea. It will raise the current that could burn out components. To repair you would need to determine what was burned out and how easy it would be to replace.
Will a 12v car battery safely work for 9V 3.5A device?
No.
Can you use a 12V adapter in place of a 9V?
no, different voltage could fry solid state components.
Can you use 12v 1000ma instead 12v 150ma?
12v 1000mA means that the maximum output of that unit is 1000 milliamps at 12 volts. 12v 150 mA means that the maximum output of that unit is 150 milliamps at 12 volts. So if you need 150 milliamps at 12v either will do. BUT if you need over 150 milliamps at 12v then you must go for the 1000 mA unit. By the way there are 1000 milliamps in 1 amp.
Can i use 9v dc with 12v dc?
No. 9 v is only 75% of 12 v.
Which uses less power a 9v CD player operating off of a WAGAN 12 v power supply inverter or a 9v CD player operating off a 12-volt-to-9-volt converter plugged to the WAGAN 12v power supply?
A 9V CD player operating through a 12-volt-to-9-volt converter plugged into the WAGAN 12V power supply will use less power because the converter will efficiently step down the voltage to match the CD player's requirements, resulting in less energy loss compared to using an inverter to power the CD player directly at 9V.
Can 9V 1A adapter be used for 12V 1A speakers?
No. If it works at all, it will be underpowered, and possibly damage the speakers. To power 12V speakers, you have to have an adapter with EXACTLY 12V (no more, no less), and at least 1A. You could hook up a 12V 4A adapter if you wanted to, your speakers would just only draw 1A of power. Make sure you use a 12V adapter though!!
Is the power supply for a Digitech whammy II 9v or 12v I need the specs for the power supply?
whammy 2 specs. ps750 class 2 transformer Ac-Ac power supply input: 120vac 60Hz 12w output 9v AC 780mA
Can Charge 9v with 12v dc power?
No, not possible. The charger has to go to higher volts than the battery being charged.
How much work does 9V do in moving 8.5x1018 electrons?
The work done by a voltage source (9V) in moving electrons is calculated by multiplying the voltage by the number of electrons and the charge of a single electron (1.6x10^-19 C). Therefore, the work done in this case would be 9V * 8.5x10^18 * 1.6x10^-19 C = 1.224 J.
Can you power 5 meter 12v led strips with a 9v battery?
They might burn but they would be very dim and the battery would last for a very short time. They are 12 volt lights therefore it will take 12 volts for them to burn at the level of brightness that they should.
What is meaning of 9v-0-9v transformer?
It is kind of transformers called center-tap transformer its main function is to transform primary voltage to 2 secondary voltages or vice versa. In your statement the transformer will convert the input voltage to 2 voltage each is 9v or the opposite it will convert the 2 input voltages with each 9v to a certain value depending on the turns ratio of the transformer.
Can a 9 volt adaptor be used on a appliance that calls for 9volt battery or 12volt adaptor?
No. The person who designed your appliance had a 12v adapter, so when he designed the adapter connector he put a resistor in it to drop the voltage to 9v.
