0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How do you calculate the amount of current that will go through the resistor a 12 volt battery a resistor of 470 ohms?
Ohm's Law: Current is voltage divided by resistance.12 volts divided by 470 ohms is 25.5 milliamperes.Power is voltage times current, so power in this case would be 12 volts times 25.5 milliamperes, or 0.306 watts. As a result, you need at least a one half watt resistor, and I would prefer a one watt resistor, because it is going to get a bit warm, and a margin of safety is always a good thing. This is particularly true when you consider tolerances, such as the battery actually putting out 13 or 14 volts and the resistor being on the low side, at 470 - 10%, or 423 ohms. (0.463 watts - too close to one half watt for comfort)
How do you run a motor 208 volts ac in a 230 volts suply?
If your motor is rated for only 208 volts you may not be able to use 230 volts for it. It will run, but may shorten the life of the motor. Motors are rated with a 10% tolerance for voltage. This means that a 208 volt motor has a maximum voltage rating of 228.8 volts. So measure you voltage supply and see if it is below 228.8 with a good RMS voltmeter. If it is, you are good to go. If it is not there are two ways to make it work. 1. Put a high wattage ballast resister in series with the supply voltage to drop the voltage to the motor within range of 187.2 to 228.8 volts. To determine the value of the resistor take the Horse Power of the motor and multiply it by 746. This will give the wattage of the resistor, use one at least 20% larger. Next take the Rated Load Amps (RLA) or Full Load Amps (FLA) of the motor and divide it into the difference between 230 (voltage supply) and the 208 (rated motor voltage), this will get you close to the resistance value of the Ballast resistor you need to use. So a 1/2 HP motor with a 1.2 RLA will require about a 18 ohm, 500 watt ballast resistor. This is not the recommended method, but will work. 2. Install a Buck & Boost transformer rate for the HP of the motor that will Buck the supply voltage for the motor down to 208 volts. This is the recommended way and the only way it should be done. Any good commercial electrical supply house can help you properly size the transformer that you will need.
What way round does a resistor go?
Does not matter!
What size inverter do you need to go from ac to dc for a Kenmore model 16562 chest freezer?
A: It not size but rather capacity. the capacity will be the ac power consumption AC volts X AC current that will get Watts. So the capacity of the inverter should be the same watts plus a safety and efficiency power if the watts is 100 watts i would buy a 125 watts minimum
Are all large motors three-phase?
Yes, most large motors are three phase. Usually single phase motors only go up to 10 HP. Larger than this and the wire size and contactors used to control the motors becomes extreme. For example a single phase 10 HP motor on 115 volts draws 100 amps. The same single phase motor on 230 volts draws 50 amps. The same 10 HP motor on three phase system draws the following amperage; 230 volts is a 28 amp draw, 460 volts is a 14 amp draw and 575 volts is a 11 amp draw. As you can see the higher the voltage becomes, the smaller the wire feeder size is needed and much smaller size contactor can be used to control the motor.
How do you reduce 48 volts dc to 12 volts dc with resistors?
Yes. You can use a voltage divider. Say, for instance, one 1KOhm resistor in series with a 3KOhm resistor. Connect the 3k resistor to the 48 volts and connect the 1k resistor to ground. The 1k resistor will have 12 volts acress it. These resistors need to be at least 1 watt each as they are going to dissipate 0.576 watts and get warm. Now, if you attempt to pull power from the 1k resistor, note that regulation will be poor because the impedance of the load will go in parallel with the 1k resistor and change its value.
How many volts does a flashlight need to make it work?
The answer is governed by the size of the flashlight. Count the amount of batteries that go into the flashlight and then multiply by 1.5 and this will give you the voltage of the flashlight. For NiCd and NiMH rechargeable batteries multiply by 1.3 volts.
How do you calculate the amount of current that will go through the resistor a 12 volt battery a resistor of 470 ohms?
Ohm's Law: Current is voltage divided by resistance.12 volts divided by 470 ohms is 25.5 milliamperes.Power is voltage times current, so power in this case would be 12 volts times 25.5 milliamperes, or 0.306 watts. As a result, you need at least a one half watt resistor, and I would prefer a one watt resistor, because it is going to get a bit warm, and a margin of safety is always a good thing. This is particularly true when you consider tolerances, such as the battery actually putting out 13 or 14 volts and the resistor being on the low side, at 470 - 10%, or 423 ohms. (0.463 watts - too close to one half watt for comfort)
Why zener used as reglator?
Zeners are manufactured to have exact reverse breakdown voltage. All this means is if a 10 volt Zener is installed in series with a load dropping resistor, and a voltage higher than 10 volts is across both components, the Zener will breakover and present that 10 volts to any component in parallel with it. Volts go to 20, Zener holds at 10, resistor sees the other 10 volts. Zeners operate safely in the breakover region while normal junction diodes operate in forward voltage.
What is the voltage between c and d?
I think the question probably needs a diagram with it. In general, the method to determine the voltage is to add up (sum) the voltages as you go around the circuit. Your battery or source will add volts. Most of the other devices will subtract volts. The total will be zero, or in other words, the things that add volts will equal the things that subtract volts. For example, if you have a series circuit where there is only one path, if the battery adds 12 volts and the first resistor takes away 7 volts, there will be 5 volts across the second resistor. Something to note, though, involves parallel circuits. When the circuit splits into two paths, the voltage measured between the place they split and the place they rejoin is the same.
How do you run a motor 208 volts ac in a 230 volts suply?
If your motor is rated for only 208 volts you may not be able to use 230 volts for it. It will run, but may shorten the life of the motor. Motors are rated with a 10% tolerance for voltage. This means that a 208 volt motor has a maximum voltage rating of 228.8 volts. So measure you voltage supply and see if it is below 228.8 with a good RMS voltmeter. If it is, you are good to go. If it is not there are two ways to make it work. 1. Put a high wattage ballast resister in series with the supply voltage to drop the voltage to the motor within range of 187.2 to 228.8 volts. To determine the value of the resistor take the Horse Power of the motor and multiply it by 746. This will give the wattage of the resistor, use one at least 20% larger. Next take the Rated Load Amps (RLA) or Full Load Amps (FLA) of the motor and divide it into the difference between 230 (voltage supply) and the 208 (rated motor voltage), this will get you close to the resistance value of the Ballast resistor you need to use. So a 1/2 HP motor with a 1.2 RLA will require about a 18 ohm, 500 watt ballast resistor. This is not the recommended method, but will work. 2. Install a Buck & Boost transformer rate for the HP of the motor that will Buck the supply voltage for the motor down to 208 volts. This is the recommended way and the only way it should be done. Any good commercial electrical supply house can help you properly size the transformer that you will need.
How do you reduce 32volts to 12 volts?
To reduce 12VDC to 7VDC you need a voltage divider in the ratio of 7/12, such as two series resistors of values 5KOhms and 7KOhms. Of course, this "trite" answer (the resistor divider) depends on how much power you need to supply, and how much source to load current regulation ratio you need. You might need to follow this up with an class C amplifier, compensating for the 0.6 volt drop across the base-emitter junction. You might need an OP-Amp controlled emitter follower, with a zener reference. For high current applications, you might even need a switching regulator.
Will ampere go down if you step-up 220 volts to 440 volts?
Yes, ampere will go down.
What way round does a resistor go?
Does not matter!
Need to hook up a bathroom heater requiring 240 volts but have only 110 volts outlets what is the easiest way to go about it?
The best advice anyone should give you is to call a licensed electrician to install a new 240 volts circuit for the bathroom heater for you. He will use the correct circuit breakers, the correct size wiring for the length of run from the main incoming electric power panel to your bathroom and will use a GFCI to protect you and your family from the risk of electrocution.
Fuse box display for 1991 Ford Explorer?
i need a picture of the fuse box for 91 ford explorer. Need to know outline of where different fuses go and their volts
What will cause the heater resistor to go bad repeatedly on 1986 Blazer Full Size. Heater motor is 1 year old?
Most Likely Your Blower Motor Is Going Bad.
