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Need to know more info on ur amp ratings and how many ft the wire run will be
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∙ 11y ago
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What is the permissible voltage drop in a 120 volt power supply?
5% from source to farthest load.
How long does a volt last if only given a volt?
Zero time after the supply is diconnected.
Why 250 ohm resistance using for transmitter calibration?
In this situation, to calibrate a transmitter you need a power circuit and communicator circuit. The Hart communicator used in the calibration process is connected to the power source circuit in parallel. The power source circuit is the one that has ammeter, 250 Ohm resistor, and power source all connected in series. As the transmitter sends output mA, it creates volt drop across the 250 Ohm resister. Let's say the volt drop across the resistor was 1 Volt. Now, back to the Hart communicator. It is a load, meaning there will be a volt drop across the Hart communicator. Since it is in parallel with the power circuit, it is also parallel with the resistor. So, the 1 volt drop across the 250 Ohm resistor will also make 1 volt drop across the Hart communicator. Technically speaking, the 1 volt drop across the Hart communicator is only true if its resistor is also 250 Ohm. However, it does NOT matter what voltage drop is in the Hart communcator. It only sees the "relative" voltage drop changes to measure the changes in transmitter outputs.
What size resistor is needed to drop 12 volt dc to 3 volt what is the formula?
The "size" (value or the power capacity) of the resistor can not be defined unless the power of the 3 volt bulb is known. If you tell me how many amps would the bulb draw from a 3 volt source, I will tell you exactly how many ohms of resistance, and how many watts of power capacity will be required of the resistor.
Will you save buying a 220 volt ac than a 110?
Yes, in the long run. The 220 volt unit will use less power.
How do you turn a head unit on without a car?
Get a charged 12 volt battery hook 12 volt constant/RED to the + on the battery then ground - it should power up.
How can you improve volt-drop?
A: Decreasing the current and/or the resistance
Can a 230 volt operate on 127 volt power?
No.
Can you run a 4.3v device with a 5v power adapter?
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.
Can a cellphone charge in car without key in ignition?
It depends on what kind of car you have. Some have power to the 12 volt socket without the key and some do not.
Is power factor defined as volt amps divided by apparent power?
No. The volt ampere (V.A) is the unit of measurement of apparent power. Power factor is true power (expressed in watts) divided by apparent power (expressed in volt amperes).
What is the effect of volt drop below 216 volts - on a electric power meter therefore the power bill?
The power bill depends on the energy used, and if the voltage is low that will be sensed by the voltage coil in the meter, so it is all fair.
