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This statement is correct.
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∙ 13y ago
King Coc
Gabriel Brewster
Gabriel Brewster
voltage and current vary in direct proportion
Gabriel Brewster
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What should be the current of siemens 75 kw motor at no load?
starting current of 3 phase 75 KW induction motor
What is harmonics in electrical circuits?
By simple definition, harmonics are any "non-linear" current or voltage in an electrical distribution system. An electrical harmonic shouldn't be thought of as an acoustic or vibrational harmonic, but simply as any electrical device that draws current un-proportionally to voltage. Harmonics are commonly produced by devices that rectify AC Voltages into a DC Voltages. Common harmonic producing devices are VFDs, lighting, and computers.When do harmonics cause problems?Current HarmonicsThese important bridge rectifier circuits produce current harmonics. Current harmonics do have an affect on the electrical equipment supplying harmonic current to the device (transformers, conductors). Current harmonics can cause issues with distribution equipment which has to handle the current from the utility transformer all the way down to the device, but generally don't affect other equipment connected to the electrical system. Harmonic currents can cause excessive heating to transformers. For electrical systems feeding single phase loads the third harmonic has gained attention in design consideration and transformer selection for causing the neutral conductor to draw excessive current.Voltage HarmonicsVoltage harmonics can effect sensitive equipment throughout your facility. Voltage harmonics arise when current harmonics are able to create sags in the voltage supply. When any device draws current it creates a voltage dip which is required for current to flow. This voltage dip is visible with larger loads when turning on a hair dryer or a table saw and seeing the lights dim down. The amount of sag depends on many factors like transformer impedance wire size. Current harmonics create voltage harmonics, but the magnitude of the voltage harmonics depends on the "stiffness" of your electrical distribution's "system impedance."An example to help understand current distortion verse voltage distortion is the common CFL light bulb. This low cost light bulb may have a 75% current THD (total harmonic distortion). This means that 75% of the current drawn by the bulb is considered "harmonic current". These light bulbs usually do not affect other devices in your home because even though the current drawn by the bridge circuit is rich in harmonic current, it creates very little sag in your home's voltage supply, and if you had a voltage analyzer attached you would probably see a voltage THD of well less than 1 percent.Avoiding Harmonic IssuesIf possible it is best to select equipment with a low current THD, and the result would be reduced voltage THD. If you are not able to purchase equipment with a low current THD there may be options available to you like adding line chokes or isolations transformers to reduce the harmonic currents. If you are unable to reduce current distortions and are having issues with the affects of voltage distortion there are options, such as tuned capacitor to supply harmonic current, or possibly redesigning your systems distribution to reduce system impedance.Solutions for Mitigating HarmonicsThere are many solutions to alleviating the affects of harmonics, below are some commonly applied solutions.Reduce Current HarmonicsAdd line chokes to harmonic producing equipment.Add isolation transformer to harmonic producing equipment.Use 12-pulse or 18-pulse rectifier circuits, instead of 6-pulse.Reduce Voltage HarmonicsAdd tuned capacitor banks to supply harmonic current, or change transformer size/impedance.OtherIsolate sensitive loads instead of mitigating harmonics.
What is the current of a 75 w connected across a 125 v source?
75/125 = 0.6 Ampere
What is nominal current and Load current?
Nominal Current:In respect to Current Transformers, its the allowable current in amperes which can be transmitted by each contact continuously and simultaneously.Load Current:Current flowing through the load.In General...'Nominal' means named. So the nominal current (or voltage) is the named current. For example, a charger may have a nominal current of 100 mA marked on its nameplate, but the actual current drawn by its load (the load current) may only be, say, 75 mA.
Does core losses in a transformers depend on voltage?
The most contributing factor to core losses in transformers is the material on which they are wound. Transformers wound on iron cores are roughly 75% efficient but they can transfer large amounts of power at low frequency. Transformers wound on ferrite are typically better then 90% efficient but can't be used to transfer the same amount of power unless the frequency is increased. Switch mode power supplies do this. After that, the voltage, impedance and current are all related. If you increase the current (by increasing the voltage) there are more losses because the magnetic field strength is not directly proportional to the current. The impedance remains the same for the same number of turns. Transformers are wound to the best compromise between efficiency and transfer capability. If you try to increase the voltage too much, the core will saturate and behave like a straight piece of wire.
What the fraction for 75 percent of 100 percent?
75/100 or, reduced, 3/4.
How many dB attenuation translates into 75 percent of voltage being lost to attenuation?
100 percent means full voltage or 0 dB.When 75 percent of the voltage is lost you still have 25 percent of the voltage.25 percent means damped to (-)12 dB.
75 percent as a reduced fraction?
3/4th
How do you write 75 percent in simplest form?
75% can be reduced to equal 3/4
What does 75 percent look like as a fraction?
75/100 or reduced it would be 3/4
What is voltage across a 75 ohm resistor with 1.6 A current?
120v
What is the fraction notation for 75 percent?
75/100 which can be reduced to 3/4 (by dividing both 75 and 100 by their Greatest Common Factor of 25).
If voltage constant when the current increases what does the resistance do?
In an electric circuit, ratio of current and voltage is constant which is known as the resistance of the circuit. If voltage or current is to be changed the resistance has to be changed. You cannot keep an invariable resistance in the circuit and increase current while keeping voltage as constant.Hence to vary the voltage or current in a circuit different equipments like rheostat,potentiometer are used.
What is the lowest fraction of the percent 75?
"Percent" means "per hundred." So, 75% is 75/100. The biggest number you can divide both the numerator and denominator by and still get whole numbers is 25. So, the reduced fraction is 3/4.
What is the percent of 75 percent?
The percent of 75% is 75%.
What is the voltage reading of two resistors in series that has a total resistance of 75 K?
The voltage across the ends of the series combination is 75,000 times the current through it.
What is 30 over 75 reduced to?
30/75 is reduced to 2/5.
