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Is polarity negative or positive?
Yes. Electrons always flow from the negative pole to the positive pole. In a Direct current(DC) circuit, one pole is always negative, the other pole is always positive and the electrons flow in one direction only. In an alternating Current (AC) circuit the two poles alternate between negative and positive and the direction of the electron flow continually reverses. In DC circuits (e.g. for a battery) positive is usually marked red and negative is usually marked black, but other color schemes are very common in automotive and telecommunications systems. In AC systems which are at no point connected to earth (unlike domestic mains wiring where the neutral is commonly earthed at substations and generators) polarity is not important as the two wires alternate polarity many times per second.
You are wiring a LED lamp through a transformer you have a polarized plug and you know positive and negative The transformer is marked live and neutral Does live correspond with positive or negative?
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.
Does a 220 volt ac contact get a positive and a negative?
A 220 vac circuit has 2 hot wires and a neutral. The neutral stays at 0 volts and the hot wires vary between positive and negative. When one is positive, the other is negative.
Is a red wire negative or positive?
In a DC circuit it is positive. In a 220v ac circuit it's one of the two positive (hot) lines.
If x is between a and c how are ax and ac related?
If a,b, and c are positive a < x < b means ax < cx If a,b , and c are negative a < x < b means ax > cx
Do ac capacitor have polarity?
no
Why capacitor does not store alternate current but store direct current?
Because Alternet current has both positive as well as negative cycle capacitor does not conduct for negative cycle of the Alternet current and DC all are positive cycle thats why it capacitor conduct for DC not for AC
Do electrolytic capacitors generally have polarity?
Yes. Electrolytic capacitors are polarized. Capacitors with positive and negative poles generally have positive and negative marks. Generally, for capacitors with pins, the long end of the pin is the positive electrode. For cylindrical electrolytic capacitors, there will be a vertical line printed on the negative side of the capacitor. SMD capacitors generally have no positive and negative poles. --- We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer. You may google search "JYH HSU" to find our official website.
Is 12 volts peak to peak the same as 12 volts ac?
No. 12 volts peak to peak would be 6 in the positive polarity and 6 negative polarity. Simply saying 12 volts AC would be 12 volts in each polarity or 24 volts peak to peak
The electric device which blocks DC but allows AC is called?
A capacitor is a device which blocks DC, but allows AC. When a capacitor is completely charged it does not allow current to pass through it. Initially when capacitor starts charging it has maximum current which flows and voltage is minimum, during charging current decreases with time and voltage increases. When capacitor is completely charged, it has maximum voltage and minimum current. However the AC has both positive and negative half cycles, during positive half cycle capacitor starts charging but during negative half cycle it discharges, and hence it doesn't get fully charged at AC, and current always flows through it.
What will happen if you changes the polarity of the capacitor in their respective position?
It will either explode right away, or work for a short time then explode. Note though, that the capacitor's polarity only applies to DC voltage. Because AC flows through a capacitor, if there is no DC offset, it matters not which way the capacitor goes.
Why is there a positive and negative terminal in electical device?
there are positive and negative terminal in electrical device who operate on dc power supply because they wont work if the connection is reversed. but devices who operate on ac usually dosenot have polarity marks .
Why AC waveform positive and negative voltage value compared to DC that had only positive value of the voltage?
because of the type of generator used in making ac voltage: it makes Ac which is harder to manage, but the generator is really simple. Ac switches the positive and negative, or ground polarities and the length of time it is on one polarity is determined by it's wavelength. There are also different types of waves. Sinular waves are... well,.. wavy they gradually switch polarities by slowly decreasing voltage until it is zero, then rising in voltage of the other polarity. then, there are box waves which switch directly from one polarity to another. And, your grammer isn't the best.
Why capacitor does not allow DC?
In order for a capacitor to pass current, the voltage across it must be changing. In a DC circuit, the voltage does not change so, at equilibrium, the capacitor is effectively an open circuit. We also call this DC blocking. You can take a signal with DC bias on it, perhaps because it came from a class A BJT amplifier, couple it with a capacitor, and the signal will make it through, but the DC bias will not.
Is polarity negative or positive?
Yes. Electrons always flow from the negative pole to the positive pole. In a Direct current(DC) circuit, one pole is always negative, the other pole is always positive and the electrons flow in one direction only. In an alternating Current (AC) circuit the two poles alternate between negative and positive and the direction of the electron flow continually reverses. In DC circuits (e.g. for a battery) positive is usually marked red and negative is usually marked black, but other color schemes are very common in automotive and telecommunications systems. In AC systems which are at no point connected to earth (unlike domestic mains wiring where the neutral is commonly earthed at substations and generators) polarity is not important as the two wires alternate polarity many times per second.
What causes fan to run in reverse?
(1)What happens when polarity of the fan is reversed? It depends upon your definitions of reversal of capacitor,in a series circuit reversing a capacitor in the actual sense means not a mechanical reversal by changing its metal leads,its just reversing the current direction in the capacitor. (2)Now next question is does fan capacitor have a polarity? Ofcourse it has,all capacitors have polarity,but fans capacitor is not electrolytic capacitor,so it doesnt have inbuilt polarity. (3)How we recognize the polarity of capacitor of a ceiling fan? Since it doesnt have inbulid polarity,the direction of the current entering the mesh determines positive polarity and current leaving is assumed as negative polarity.while doing mathematical analysis we can take any convention it will not affects the magnitude since we are taking modulus in calculations. (4)Final Assumption reveling the facts about fans reverse rotation If we connect the fan in such a way that currrent is leaving or reversing the direction of current,the capacitor polarity changes and fan will rotate in reverse(since it is a single phase induction motor{note: rotating magnetic field and working of fan}),need of the capacitor is it gives the initial torque and technically improves the power factor,capacitor charges and discharges with respect to the frequency of the ac and gives the stability to the system,its efficiency will be lower and speed reduces if we remove the capacitor theoratically,so finally you can say the fan rotates reverse if we change the polarity of the capacitor(indirect meaning of changing direction of current).if you want any simple mathematical analysis of the detailed explanation,mail me at "ellipsis047@gmail.com" or call me 07259434969 "Sreenath SM(India)".i can make you understand the basis of all analog and electrical circuits.
The change from negative to positive and from positive to negative in an alternating current?
Is called AC voltage or current.
