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For a sine wave, the RMS is the amplitude divided by square root of 2. The amplitude is 10 cm. in this case; so the exact value is 10 / root(2), or about 7.
For a sine wave, the RMS is the amplitude divided by square root of 2. The amplitude is 10 cm. in this case; so the exact value is 10 / root(2), or about 7.
For a sine wave, the RMS is the amplitude divided by square root of 2. The amplitude is 10 cm. in this case; so the exact value is 10 / root(2), or about 7.
For a sine wave, the RMS is the amplitude divided by square root of 2. The amplitude is 10 cm. in this case; so the exact value is 10 / root(2), or about 7.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoFor a sine wave, the RMS is the amplitude divided by square root of 2. The amplitude is 10 cm. in this case; so the exact value is 10 / root(2), or about 7.
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A series LCR circuit consisting of R10 ohms and impedence 20 ohms is connected across an ac supply of 200 v rms The rms voltage across the capacitor is?
16.32 volts
An alternator provides 20 A of Peak current at 100 Volts Peak AC to a resistive electric heater. How much heating power is delivered to the load A. 5 W B. 20 W C. 500 W D. 1000 W?
The answer is D. Why is it 1000W? How did you get that answer?
Mathematical formula for converting dc voltage to ac voltage?
I guess Vc=VmSinwt; Here Vm=Peak Voltage Vdc=Vm/(2^.5) Then We Calculate the Impedence of the Circuit.i.e. Z=(R2+(XL-XC)2).5 Now Idc=Vdc/Z This is the formula for obtaining Direct Current from Alternating Current.
What is the difference between a square wave and a sine wave?
Inverter Tutorial and Frequently Asked Questions:Q: What is an inverter?A: An inverter takes DC power (battery or solar, for example) and converts it into AC "household" power for running electronic equipment and appliances.Q: How is an inverter different than a UPS?A: A UPS typically includes the battery and battery charger in one stand alone unit. However, there are UPSs that use external batteries, and PowerStream makes inverters with battery chargers, so the differences blurr as features proliferate.UPSs also can have communication with the equipment that it is powering letting the equipment know that it is operating on standby, giving it shutdown warning, or communicating with the human in the loop. Inverters typically don't have this communication.Q: Why are they called inverters?A: Originally converters were large rotating electromechanical devices. Essentially they combined a synchronous ac motor with a commutator so that the commutator reversed its connections to the ac line exactly twice per cycle. The results is ac-in dc-out. If you invert the connections to a converter you put dc in and get ac out. Hence an inverter is an inverted converter. For more information about such converters see http:/www.nycsubway.org/tech/power/rotary.HTML (thanks to Karl W.Berger, PE for this answer).Q: What if I want a DC output to run such things as a laptop from a car cigarette lighter, or telephone equipment at -48 volts?A: Then you want a DC/DC converter. PowerStream has some DC/DC converters just for those purposes. http:/www.powerstream.com/dcdc.htmQ: What is the difference between sine wave and modified sine wave?A: Alternating current (AC) has a continuously varying voltage that swings from positive to negative. This has great advantages in power transmission over long distances. Power from your power company is carefully regulated to be a perfect sine wave, because that is what naturally comes out of a generator, and also because sine waves radiate the least amount of radio power during long distance transmission.On the other hand, a sine wave is expensive to make in an inverter, and many sine wave techniques use heavy, inefficient transformers. The most inexpensive way to make AC is to switch the DC on and off--a square wave. A modified sine wave is scientifically designed to simulate a sine wave in the most important respects so that it will work for most appliances. It consists of a flat plateau of positive voltage, dropping abruptly to zero for a while, then dropping again to a flat plateau of negative voltage, back to zero for a while, then returning to the positive voltage. This pause at zero volts puts more power into the 60HZ fundamental than a simple square wave does, so it is called "modified sine wave" instead of "square wave."Q: Can I use a modified sine wave inverter for my medical equipment?A: For Medical equipment, oxygen generators, etc. talk to the manufacturer of the equipment. PowerStream inverters are never tested or rated with medical equipment, and we don't guarantee that they will work to save your life. For such applications please find inverters that are rated and tested for such applications.Q: What about square wave inverters?A: These old-fashioned inverters are the cheapest to make, but the hardest to use. They just flip the voltage from plus to minus creating a square waveform. They are not very efficient because the square wave has a lot of power in higher harmonics that cannot be used by many appliances. The modified sine wave is designed to minimize the power in the harmonics while still being cheap to make.Q: How do I know if I need a sine wave, or if I can live with a modified sine wave?A: The following gadgets work well with a modified sine wave: computers, motor-driven appliances, toasters, coffee makers, most stereos, ink jet printers, refrigerators, TVs, VCRs, many microwave ovens, etc.Appliances that are known to have problems with the modified sine wave are some digital clocks, some battery chargers, light dimmers, some battery operated gadgets that recharge in an AC recepticle, some chargers for hand tools (Makita is known to have this problem). In the case of hand tools, the problem chargers usually have a warning label stating that dangerous voltages are present at the battery terminals when charging. We would like to add to this FAQ any appliances that you have had trouble with, or had success with, using modified sine wave inverters.Q: Why do I hear buzzing on my stereo when using a modified sine wave inverter?A: Some inexpensive stereos use power supplies that cannot eliminate common-mode noise. These would require a sine wave inverter to operate noise-free.Q: Why don't I measure rated voltages when using a multimeter on my modified sine wave inverter?A. The rated voltage is an RMS (root mean square--they square the value to make sure it is always positive, then average it, then take the square root of the average to make up for having squared it in the first place) measurement. Most multimeters are designed to give correct RMS readings when applied to sine waves, but not when they are applied to other waveforms. They will read from 2% to 20% low in voltage. Look for a voltmeter that braggs about "True RMS" readings.Q: How should I select the right size inverter?A: First add up the power ratings of all the appliances, then buy the next larger inverter! At least that is the simple answer. Note, however, that some appliances, such as table saws, refrigerators, and microwaves have a surge requirement. PowerStream inverters are designed to supply such surges, but since every appliance has its own requirements sometimes you will need to get a bigger inverter than you would otherwise think. Note that the inverter isn't the only consideration when you are pondering the mysteries of start up surges. The battery must also be able to supply the surge power, and the cables must be able to supply the increased current without dropping the voltage too much.Q: How is a microwave rated for wattage?A: When you buy a microwave oven you want to know how intense the microwave field is, not how much the oven draws from the wall. So a microwave oven that boasts 600 watts on the box, will have 1200 watts on the boilerplate in the back. Don't be fooled!Q: Are stereo amplifiers rated the same way?A: Stereo manufacturers are bigger liars than politicians. Some times they use peak output power (milliseconds), sometimes they use power drawn from the wall, but often they just look at the competition's carton front and add 10%. However the truth is available: look at the boilerplate sticker, which has been evaluated by UL.Q: Why do I need such humongous cables to the battery when a small cord takes the AC output fine?A: Power is volts times amps (Watts = V x A). So if you have a lot of voltage you don't need many amps. Roughly you need 12 times as much current from the 12 volt battery as you need from the 110 volt AC outlet. Current is what causes cables to heat up, not voltage. That is why they use thousands of volts in power transmission grids. The thing to do when you have lots of current is to lower the resistance of the cable. The larger the wire the lower the resistance. Think of the cable as a water pipe. A big pipe (wire) can carry more water (current or amperage) with less pressure (voltage), and will present less pressure (voltage) drop from one end of the pipe to the other.Another consideration is how far the cable has to run from the battery to the inverter. Long cable runs are expensive, either in copper or efficiency, or both.Q: Why would you use a 24 volt inverter instead of a 12 volt inverter?A. At a given power rating a 24 volt inverter will need half the current as a 12 volt inverter. This makes the entire system more efficient, and since high current transistors are expensive, the inverter will be cheaper.Q: Should I use aluminum wire, or must I use copper?A: Aluminum is cheaper and lighter, but it also has higher resistance for a given gauge and is more difficult to connect to. If you are an expert in such things, or know one, and need the advantages that aluminum gives, go ahead. If not, why not use the best conductor, copper? (Silver is slightly better, but it is cheaper to use a larger diameter copper). To compare the two look at our web page http:/www.powerstream.com/Wire_Size.htm .Make sure to use good insulation, 90°C rated or better. Also, running two sets of parallel wires instead of one can cut down on the wire heating due to more surface area.Make sure to follow all applicable electrical codes. Inverters must be grounded properly, and treated with respect, since they put out potentially lethal voltage. A lot of smart people have worked for 100 years to develop rules which will keep you out of trouble if followed. These rules are called the national electrical code, and your friend the electrician has it memorized (or knows where to look it up).Q: Should I use a laser printer with an inverter?A: Only if you must. Laser printers use up a surprising amount of power (due to the heated rollers), and will discharge your battery faster than you expect, even on standby. If you do, make sure the inverter is rated for the power of the printer plus computer plus monitor. It doesn't do any good to have your computer brown out as soon as the the printer starts to print. Ink jet printers, on the other hand, use a surprsingly low amount of power.
What is the time period of a wave produced by a 6 pole alternator which is driven at 1000 rpm?
20 milliseconds
Discuss the three types of inverters?
1.Square wave: This is one of the simplest waveforms an inverter design can produce and is useful for some applications. 2.Sine wave: A power inverter device which produces a multiple step sinusoidal AC waveform is referred to as a sine wave inverter. To more clearly distinguish the inverters with outputs of much less distortion than the modified sine wave (three step) inverter designs, the manufacturers often use the phrase pure sine wave inverter. Almost all consumer grade inverters that are sold as a pure sine wave inverter do not produce a smooth sine wave output at all, just a less choppy output than the square wave (one step) and modified sine wave (three step) inverters. In this sense, the phrases pure sine wave or sine wave inverter are misleading to the consumer. However, this is not critical for most electronics as they deal with the output quite well. Where power inverter devices substitute for standard line power, a sine wave output is desirable because many electrical products are engineered to work best with a sine wave AC power source. The standard electric utility power attempts to provide a power source that is a good approximation of a sine wave. Sine wave inverters with more than three steps in the wave output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or square wave (one step) types of the same power handling. Switch-mode power supply (SMPS) devices, such as personal computers or DVD players, function on quality modified sine wave power. AC motors directly operated on non-sinusoidal power may produce extra heat, may have different speed-torque characteristics, or may produce more audible noise than when running on sinusoidal power. 3.Modified sine wave: A modified sine wave inverter has a non-square waveform that is a useful rough approximation of a sine wave for power translation purposes. The waveform in commercially available modified-sine-wave inverters is a square wave with a pause before the polarity reversal, which only needs to cycle back and forth through a three-position switch that outputs forward, off, and reverse output at the pre-determined frequency.Switching states are developed for positive, negative and zero voltages as per the patterns given in the switching Table 2. The peak voltage to RMS voltage do not maintain the same relationship as for a sine wave. The DC bus voltage may be actively regulated or the on and off times can be modified to maintain the same RMS value output up to the DC bus voltage to compensate for DC bus voltage variation. The ratio of on to off time can be adjusted to vary the RMS voltage while maintaining a constant frequency with a technique called PWM. The generated gate pulses are given to each switch in accordance with the developed pattern and thus the output is obtained. Harmonic spectrum in the output depends on the width of the pulses and the modulation frequency. When operating induction motors, voltage harmonics are not of great concern; however, harmonic distortion in the current waveform introduces additional heating and can produce pulsating torques. Numerous electric equipment will operate quite well on modified sine wave power inverter devices, especially any load that is resistive in nature such as a traditional incandescent light bulb. Most of the AC motors will run on MSW inverters with an efficiency reduction of about 20% due to the harmonic content. However, they may be quite noisy. A series LC filter tuned to the fundamental frequency may help.
What is the period of a 50 kHz sine wave?
Period = 1/frequency = 1/50,000 = 0.00002 second = 20 microseconds
What is the sine of 20 degrees?
sine-1(0.3420201433) = 20 degrees
Top of a sound wave is called what?
the highest point of a wave (transverse) is called a "crest" and the lowest point of a tranverse wave is called "trough"
Do you need to run an amp with subwoofers?
Yes. Most head units only put out about 15-20 watts RMS, you need more than that to properly power a subwoofer. Ignore peak ratings, only use RMS ratings to match everything together.
What is the difference between hertz and frequency in hearing?
Hertz and Frequency are the same thing = cycles-per-second. When used for the vibration of something .. like an electromagnetic sine-wave . . . then if that sine-wave is vibrating with a frequency between 20 Hz and 20,000 Hz, the human ear can "hear" it. If an electromagnetic wave vibrated much faster .. around 10^^15 Hz, then you'd be able to SEE it.
When was Sine Totoo created?
Sine Totoo was created on 2007-02-20.
How many watts is 20 rms watts?
Rms is watts that's the amount of watts a speaker is rated for.
What does 20 watts RMS50 peak x 4 channels mean in a car stereo?
RMS is basically the amount of watts that the stereo can continuously dish out and the peak is like the most watts it can give out but only in bursts. And the the amount of channels is how many speakers it can give power too. So basically you can continuously give out 20 watts to each speaker if you have four hooked up to the thing.
What is the sine ratios of 20 degrees angle?
sin(20) = 0.3420 (approx).
What is the RMS power rating for a vintage Sony STR-VX750?
Don't have a set of schematics for that amp, so let me ask you this: Do you know the peak watt output of the amp? (Be careful if it has an extra power socket on it because that usually says something like 750 watts, which really indicates the power handling capability of the socket and associated relay). Anyway, if you can find the peak watts on the back somewhere, just multiply the peak watts by .707, which should give you a very close approximation of the RMS watts within a watt or two. Normally, most home receivers/power amps average 20 to 50 watts, RMS, depending on the type of output drivers being used.
Why did sm u 20 sink rms lusitania?
hell if i know
