Does a capacitor block ac current dc current or both?

Answer 1

No you can't use DC capacitors in Ac because in DC current , the current flows directly while in AC current, the current flows curved zig-zag. Thus Dc equipment can't mingle with AC as they need Direct flow. So DC capacitors can't be used for AC current...................

Answer

Most capacitors will operate on either DC or AC. The exception is the polarised-type capacitor, which is designed to operate with a DC or an appropriately-biased supply.

Often, a capacitor's rated voltages is specified in terms of DC -for example, '100 V (DC)', so care must be exercised if it is to be used with AC. This is because we always measure AC voltages as root-mean-square (rms) values, not as peak values. For example, '100 V (AC)' actually peaks at 141 V*. So, applying 100 V (AC) to a capacitor rated at 100 V (DC) may cause its dielectric to fail. In this example, the maximum allowable AC voltage must be 70.7 V, which peaks at 100 V.

(*To explain: Vrms = 0.707 Vmax )

Answer 2

NO! dont!!

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On the contrary, yes you can use a.c. capacitors in a d.c. circuit.

You can also use most capacitors in an a.c. circuit. The exception being electrolytic capacitors, which can be used only with d.c.

Answer 3

No. A capacitor can only be charged with a DC supply, or with an AC supply rectified with a diode, essentially making it a DC supply.

If you put AC across a capacitor it will act like a short circuit. Capacitors pass AC current through them. Each half of the alternating current will charge and then discharge the plates, causing an AC flow through it.

Answer 4

There is a distinction between the capacitors commonly used in AC circuits versus DC circuits, but they are not referred to as AC capacitors and DC capacitors. Instead, capacitors that have one lead that must always be kept at a higher voltage than the other lead are referred to as 'polarized', while capacitors that support both positive and negative voltages are referred to as 'non-polarized'. Since pure AC circuits have both positive and negative voltages, non-polarized capacitors may be referred to as 'AC capacitors' while polarized capacitors may be referred to as 'DC capacitors'.

The circuit equations for polarized and non-polarized capacitors are the same when they are within their operating ranges. The only difference is that polarized capacitors are generally destroyed when subjected to negative voltages. This leads to different usage scenarios.

Answer 5

A CAPACITOR BLOCKS DC CURRENT AND PASSES TO AC CURRENT

Answer 6

Many types of capacitor can work with either ac or dc. An exception is electrolytic capacitors which must be connected to a dc circuit with positive and negative the right way round.

Answer 7

Yes. Capacitors act as insulators for DC.