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When might it be necessary to use a 2 µF polyester capacitor rather than a 2 µF electrolytic capacitor?
when high voltages are present because the voltage rating of polyester (polyethylene terephthalate) capacitor is high as well as electrolytic capacitor will destroy if the voltage increases from nominal voltage and cause short circuit conditions.
What else can I help you with?
Does polyester breathe, or is it more likely to trap heat and moisture?
Polyester is more likely to trap heat and moisture rather than breathe.
Why capacitor can be defined in kvar?
Capacitors designed to be used for power-factor correction are rated in reactive volt amperes, rather than in farads.The reason for this is that in order to determine the necessary correction, a load's existing reactive volt amperes is first calculated, then the reactive volt amperes of the capacitor must be determined in order to achieve the required value of power factor. In other words, the capacitance (in farads) of the capacitor is irrelevant to the calculation.
Can an 2 farad capacitor still be used if the terminals were crossed at connection?
I Rather not think that you can buy 2 farad capacitor and no the terminals must follow polarity guidelines.
I charged a homemade capacitor with a 9v you touched your tongue to the capacitor and you got no charge?
In order to feel 9V on your tongue, you need enough current, for enough time, for your brain to recognize the current.Homemade capacitors tend to be rather low in capacitance. The resistance of your tongue might then discharge the capacitor rather quickly, and you might not notice the voltage before it goes to zero. Try this with a large capacitor, such as a few hundred microfarads and see what happens. Please do not charge the capacitor to more than 9V - you do not want to hurt yourself!
How do you calculate capacitor rating for improving power factor?
Power-factor capacitors are rated in reactive volt amperes. To determine the appropriate rating, it is necessary to determine the existing (inductive) reactive power of the load, then determine the amount of (capacitive) reactive power necessary to achieve the desired power factor (it's rarely economical to try and achieve unity power factor), and this will be the necessary reactive power of the capacitor bank.The capacitance of power-factor correction capacitors is not really relevant to the calculation, which is why they are rated in reactive volt amperes, rather than in farads.
Why polyester clothes dry quickly?
Because it's made out of gasoline (well, oil). Actually, compared to other common clothing materials, polyester doesn't burn well. That is, it tends to burn very slowly, and prefers to melt when exposed to flame. This is usually the result of the chemical structure of the particular polyester molecule, as most polyester molecules are "tightly structured"; that is, they have multiple bonds between atoms, making it much harder for them to be split and oxidize. Rather than split the polyster molecule (or, be able to add an OH radical), the addition of heat tends to force a realignment of multiple molecules in the polyester fabric - thus, they melt first, rather than ignite. Overall, this is tendency to melt rather than burn is reflected in the much higher heat capacity of polyester relative to other common fabrics (cotton, rayon, etc.).
Is polyester eaten by insects or rotted by fungus and moulds?
Polyester is a synthetic fabric made from petroleum-based fibers, and it is not a natural material. As a result, insects typically do not consume polyester, and it is not readily broken down by fungi or molds like natural fibers. While some microorganisms can degrade certain plastics over long periods, polyester is generally resistant to biological degradation. Therefore, polyester tends to persist in the environment rather than being eaten or rotted by pests or fungi.
An element that conducts heat and electricity poorly and that does not form positive ions in an electrolytic solution?
An element that fits this description is sulfur. Sulfur is a nonmetal that is a poor conductor of heat and electricity. In electrolytic solutions, it does not typically form positive ions because it tends to gain electrons rather than lose them.
How did romans dry off after bath?
They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.They used towels if necessary, just as we do, although their towels were of softwool rather than cotton.
Which element acts as feedbacking element in current series feedback amplifier?
A: It not an element but rather a components like a resistor or capacitor and/or a combinations of both.
What kind of capacitor used in ac voltage storage?
capacitors cannot store AC. neither can inductors.AnswerWith the exception of polarised (electrolytic) capacitors, most capacitors can be used with a.c. systems -providing their voltage rating (which is often expressed as a d.c. voltage) exceeds the peak value, rather than the r.m.s. value, of the a.c. supply.Capacitors are not used for storing electrical charge in a.c. systems, but are widely-used for power-factor improvement, single-phase induction motor starting, etc.
Which type of a capacitor is used for power factor correction?
A.C capacitorAnswerGenerally speaking power-factor capacitors are oil-impregnated paper capacitors -i.e. capacitors whose dielectric is manufactured from oil-impregnated paper. Power-factor capacitors are rated in reactive volt amperes, rather than in farads.There is no such thing as an 'AC capacitor', as all capacitors (other than polarised capacitor) can operate on either AC or DC.
