How capacitors behave in ac?

Answer 1

1. Compressor

2.A fan

3.A gas, like freon, which vapourises @ a temp lower than room temp

4.The tubing/Piping

An AC is a heat transfer operation.The gas(in the form of a liquid) travels through the piping and it evaporates very quickly cooling the tube.The fan blows air across the tubes into the room, now to turn back the evaporated gas into a liquid so that it can be evaporated again, it is led into the compressor, the compressor is basically a mechanical component, which squeezes the gas back into liquid so that it can be evaporated again, this happens continously, and during compression, a lot of heat is generated, which is thrown into the outside atmosphere.This is the basic working of any refrigating device.

Answer 2

A capacitor will charge and discharge according to the polarity applied to its plates, thus allowing alternating currents to pass through it whilst still blocking any flow of direct current.

Passing ac signal currents between successive stages of a radio receiver or amplifier is a very good example of a common application of this ability of capacitors to pass ac.

Answer 3

In practice, sometimes an inadequately rated capacitor is connected to AC --

A: Nothing if the capacitor is non polarized and the right voltage rating. It will eventually blow up if the capacitor is polarized since AC contains positive and negative voltage

In practice, a properly rated capacitor (non-polarized, rated to handle voltages larger than any it will actually see) will act pretty close to an ideal capacitor -- the small amount of energy lost in its parasitic equivalent series resistance is usually insignificant.

In theory, when an ideal capacitor is connected to an AC circuit,

the capacitor will alternate between charging and discharging.

In theory, all the energy that flows into the capacitor during any one part of the cycle will be entirely released back into the rest of the circuit during some other part of the cycle.

The RMS flow of electrons will be proportional to the capacity of the capacitor and also proportional to the AC frequency and AC amplitude.

Properly-rated capacitors are used in AC circuits for a variety of purposes --

motor start capacitors, power factor correction, to absorb unwanted high-frequency energy, to transfer desired audio signals from one place to another while blocking unwanted low-frequency signals and unwanted "DC" offsets, etc.

Answer 4

No. Capacitors store DC voltage. (Technically, charge) Plus, they store voltage, not current, so the question is invalid. You need a rectifier diode to convert AC to DC before attempting to charge a capacitor.

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Yes, the capacitor is charged to the maximum at that part of the cycle where the current is zero, which happens when the voltage across the capacitor is at its maximum.

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Absolutely charges and discharges the net result is zero. However, if the capacitor is polarized, such as being an electrolytic capacitor, or even if the capacitor is non-polarized but of the right value, it is possible that imposition of an AC source could cause it to explode. You need to look at the circuit design carefully before you consider doing something like this.

Answer 5

A capacitor will oppose the flow of alternating current, due to its capacitive reactance, (symbol: Xc) which is measured in ohms.

Capacitive-reactance is directly proportional to the capacitance (C) of the capacitor and the frequency (f) of the supply voltage. So, at higher frequencies, for example, the capacitor's capacitive reactance will be higher.

The total opposition of a typical capacitive circuit to the flow of AC current, is called impedance and this is the vector-sum of the circuit's resistance (all circuits will have some degree of resistance) and capacitive reactance.

Answer 6

The capacitor will act just like a resistance on an AC voltage,

And the value of the resistor will be 1/(2*pi*f*C)

Where,

pi= 3.1416....

f= frequency of the AC voltage

C= capacitance of the capacitor