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A voltage divider (two resistors in series) will achieve the required result. The value of the resistors will depend on what current is required to be supplied. It also matters what variation from 3V is allowed since taking current will make the voltage drop.
An electronics parts shop will sell components to make a more efficient system.
Or you could get 3 voltage regulators .. 9V then 5V then 3V in series .. that should keep the voltage stable as long as the 9V supply is
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What is 9 volts across a 300 ohm resistor?
9v
How can you make a LED light up on only one 1.2 volt battery?
A: WELL you cannot not with 1,2v most LED start emitting at 1.8 v some as high as 5 volts . two need at least two 1.2 volts better is 9 volts then there is a problem voltage wise but the problem is now that you need a limiting resistor to ensure at least 10ma of current
1 amp current at 14 volts causes a .9 volt drop across a switch. what is the resistance at the switch?
V = I*RIf you solved this for resistance, this means you would have:V/I = RYou set V = .9 volts, I = 1 amp, and solve to get .9 Ohms.
Four 9-volt batteries are connected in parallel how much voltage is active across the circuit?
Four 9v batteries connected in a parallel will still emit 9 volts because you are not increasing the voltage, you are increasing the life. To increase the voltage of four 9v batteries, you must connect them in a series; that series will emit 9v X 4(batteries), which equals 36 volts.
How do you convert 12 volts dc to 3 volts dc for LED?
Depends on the led forward bias threashold, if its a typical led it will be .7 volts so, .7x6=4.2V, so pick a resistor that will drop around 7 volts. What is the current? Then just to V=IR, 7=IR.
How many volts are in 9 kilo-volts?
Kilo means 1,000. So there are 9,000 volts in 9 kilovolts
How much volts to use a 9 mag tattoo needle?
How many volts for a 9 mag
How do you use the voltage multiplier to get 27 volts out of one 9 volts battery?
You can only do that with a transformer. Or you can wire three 9 volt batteries in series to get 27 volts.
How do you change 110 volt washer wall plug to 220 volt wall plug?
You don't. Voltages are a nominal rating. 110 volts is within the nominal range at this potential. The voltage centre line is 115 volts. Utility companies are mandated to keep voltages locked within 5% of a centre line voltage. This means that it could be as high as 115 + 5% = 120.75 volts and as low as 115 - 5% = 109.25 volts
Change Ac volts to dc volts?
Use a full wave bridge rectifier.
Change the battery voltage to 9 volts Once you have redone each of the tables what is the new voltage across light bulb 2?
it would be 3v
Why does the heat fan only work on high?
You need to change the blower motor resistor, it cuts the power down from 12 volts to lesser volts, so you get 1,2,3,4,5 levels of heat. When the resistor goes out, it only puts out 12 volts, so only high works. It's about a 30 dollar part, and you usually have to remove the glove box, pretty easy really.
What does trouble code p0138 on 2001 dodge 1500 mean?
Downstream O2 sensor circuit volts high.Downstream O2 sensor circuit volts high.
10 ohms plus 9 volts equals how many amps?
Ohm's Law: Voltage = Amperes times Resistance 9 volts = amps * 10 ohms amps = .9
What are examples of voltage?
220 volts, 110 volts, 440 volts, 400 volts, AC or DC voltage. High voltage like - 220 KV, 400 KV, etc
Can a 7.5 volt charger be used on a 9 volt appliance the appliance is a weighing machine?
No. The voltage of the charger's output is only 7.5 volts. This is not high enough to charge a 9 volt battery device.
Would current of 126 volts be detrimental to your appliances that are rated for 120 volts?
yes, 126 is a little high.. 1 or 2 volts ok
