capasitor yg dipake capacitor spek yg mana ya? yg saya tahu 47uF tapi ada
batesan voltage nya dalam D(CMIIW). kalo yg AC apakh sama? maklum sudah lama
nggak otak-atik .
Regards
On 10/10/07, Henkie Basuki Djayapranata <[EMAIL PROTECTED]> wrote:
>
> Setahu saya, kalau sekering nya atau MCB nya 4 amper, berarti daya yang
> bisa digunakan adalah 4 x 220 = 880 VA dan di bulatkan menjadi 900 VA.
> Jadi untuk yang 6 amper, daya yang bisa digunakan adalah 1320 VA dan
> dibulatkan menjadi 1300 VA.
>
> Kalau beban yang dipasang adalah beban yang bersifat resistif, seperti
> setrika listrik, pemanas air, rice cooker, maka nilai VAnya sama dengan
> nilai Watt.
>
> Namun, kalau bebannya yang dipasang, bersifat induktif, seperti pompa air,
> AC, kulkas, bor listrik, maka nilai VAnya tidak sama dengan nilai Watt.
> Dalam perhitungan, perbedaannya di definisikan dengan faktor yang disebut
> sebagai cos phi.
>
> Demikian juga dengan kalau beban yang dipasang, bersifat kapasitif.
>
> Perbedaan, disebabkan karena bentuk gelombang, kalau di"lihat", antara
> arus dan tegangannya, saat di bebani, tidak berimpit atau sefasa dengan
> bentuk gelombang tegangan, bisa arusnya lebih dahulu, bisa juga lebih
> belakang.
>
> Karenanya, banyak dijual alat "penghemat listrik" yang kebanyakan, isinya
> hanya berupa capacitor antara sekitar 10uF sampai dengan 47uF yang
> dipasangkan secara paralel dengan sumber listrik, dengan tujuan
> mengkompensasi beban yang bersifat induktif, menuju menjadi beban resistif.
> Dengan cara ini, kalau bebannya banyak yang induktif, terutama AC, maka
> kalau diukur, arus listrik nya akan menurun.
>
> Di rumah saya, dengan variasi beban dari berat sampai ringan, kalau
> menggunakan capacitor 22uF, bisa antara 3.6% sampai dengan 39.1% dan
> dengan capacitor 22uF, bisa antara 4.8% sampai 26.1%. Karenanya saya
> gunakan yang 47uF, karena bisa menurunkan sampai 4.8% saat beban penuh.
>
> Nah, untuk rumah tangga, karena yang terpasang adalah KWH meter, bukan KVA
> meter, maka alat yang menggunakan capacitor ini, tidak akan menurunkan
> rekening listrik tapi hanya menurunkan arus listrik. Dengan menurunkan arus
> listrik, maka beban yang bisa dipasang, akan bisa lebih banyak (dan dengan
> sendirinya, akan menambah biaya rekening listrik)
> Namun untuk industri, pemasangan capacitor ini, akan menurunkan biaya
> rekening listrik. Karenanya, di industri tersedia berbagai capacitor bank
> untuk digunakan sebagai alat penghemat listri.
>
> Salam.
>
> ----- Original Message -----
> From: tenly sulistyo
> To: ITCENTER@yahoogroups.com <ITCENTER%40yahoogroups.com>
> Sent: Tuesday, October 09, 2007 9:19 PM
> Subject: Re: Balasan: Re: [ITCENTER] Power Supply <cukup gak?>
>
> salam kenal Jungki mungkin bisa di jelaskan apa yang di maksud cos phi
> tersebut, karena jika saya tanya orang pln seperti di bawah ini. untuk
> mendapatkan watt.
>
> Listrik di rumah saya 900 watt MCB di depan panel PLN 4 Amp Voltase rumah
> saya 220 Volt
>
> 900 watt = 220 Volts * 4 Ampere
>
> Listrik di rumah saya 1300 watt MCB di depan panel PLN 6 Amp Voltase rumah
> saya 220 Volt
>
> Benar tidak 1300watt = 220 volt x 6 Amp
>
> soalnya kalo saya tanya orang orang listrik di rumah berapa 2200 dan saya
> lihat MCB PLN 10 Amp dan voltasenya 220 Volt
> Setelah saya hitung 2200watt = 220 v * 10
>
> Jadi
>
> Watt = V x A
>
> Persamaan matematikanya
>
> Watt = VA
>
> Benar tidak ?
>
> Mohon di koreksi jika ada kesalahan.
>
> Terima Kasih
>
> Regards
>
> ////////
> ----------------------------------------------------------///
> How Electricity Works
> by Marshall Brain
>
> Inside This Article
> 1. Introduction to How Electricity Works
> 2. Electricity Basics
> 3. Generators
> 4. Electrical Circuits
> 5. Voltage, Current and Resistance
> 6. Direct Current vs. Alternating Current
> 7. Electrical Ground
> 8. Lots More Information
> 9. See all Physical Science articles
>
> 5.Voltage, Current and Resistance
>
> If you live in the United States, the power outlets in the wall of your
> house or apartment are delivering 120 volts.
>
> Imagine that you plug a space heater into a wall outlet. You measure the
> amount of current flowing from the wall outlet to the heater, and it is 10
> amps. That means that it is a 1,200-watt heater.
>
> Volts * Amps = Watts
>
> ... so 120 volts * 10 amps = 1,200 watts.
>
> This is the same for any electrical appliance. If you plug in a toaster
> and
> it draws 5 amps, it is a 600-watt toaster. If you plug in a light and it
> draws half an amp, it is a 60-watt light bulb.
>
> Let's say that you turn on the space heater, you go outside and you look
> at
> the power meter. The purpose of the power meter is to measure the amount
> of
> electricity flowing into your house so that the power company can bill you
> for it. Let's assume that nothing else in the house is on, so the meter is
> measuring only the electricity used by the space heater.
>
> Your space heater is using 1,200 watts. That is 1.2 kilowatts -- a
> kilowatt
> is 1,000 watts. If you leave the space heater on for one hour, you will
> use
> 1.2 kilowatt-hours of power. If your power company charges you 10 cents
> per
> kilowatt-hour, then the power company will charge you 12 cents for every
> hour that you leave your space heater on.
>
> 1.2 kilowatts * 1 hour = 1.2 kilowatt-hours
>
> 1.2 kilowatt-hours * 10 cents per kilowatt-hour = 12 cents
>
> Similarly, if you have a 100-watt light and you leave it on for 10 hours,
> the light will consume 1 kilowatt-hour (100 watts * 10 hours = 1
> kilowatt-hour).
>
> If you have a 20,000-watt heat pump and you leave it on for five hours
> every
> day, you will consume 100 kilowatt-hours per day (20 kilowatts * 5 hours =
> 100 kilowatt-hours), or 10 dollars of power per day if a kilowatt-hour
> costs
> a dime. If you do that for a month, your heat pump costs you (30 * $10)
> $300
> per month. That is why your electric bills can get so high when the
> temperature is very cold -- the heat pump runs a lot.
>
> The three most basic units in electricity are voltage (V), current (I) and
> resistance (r). As discussed previously, voltage is measured in volts, and
> current is measured in amps. Resistance is measured in ohms.
>
> We can extend the water analogy a bit further to understand resistance.
> The
> voltage is equivalent to the water pressure, the current is equivalent to
> the flow rate, and the resistance is like the pipe size.
>
> There is a basic equation in electrical engineering that states how the
> three terms relate. It says that the current is equal to the voltage
> divided
> by the resistance.
>
> I = V/r
>
> Let's say you have a tank of pressurized water connected to a hose that
> you
> are using to water the garden. What happens if you increase the pressure
> in
> the tank? You probably can guess that this makes more water come out of
> the
> hose. The same is true of an electrical system: Increasing the voltage
> will
> make more current flow.
>
> Let's say you increase the diameter of the hose and all of the fittings to
> the tank. You probably guessed that this also makes more water come out of
> the hose. This is like decreasing the resistance in an electrical system,
> which increases the current flow.
>
> When you look at a normal incandescent light bulb, you can physically see
> this water analogy in action. The filament of a light bulb is an extremely
> thin wire. This thin wire resists the flow of electrons. You can calculate
> the resistance of the wire with the resistance equation.
>
> Let's say you have a 120-watt light bulb plugged into a wall socket. The
> voltage is 120 volts, and a 120-watt bulb has 1 amp flowing through it.
> You
> can calculate the resistance of the filament by rearranging the equation:
> r=V/I. So the resistance is 120 ohms. If it is a 60-watt bulb, the
> resistance is 240 ohms.
>
> Beyond these core electrical concepts, there is a practical distinction
> that
> happens in the area of current. Some current is direct, and some current
> is
> alternating -- and this is a very important distinction.
>
> /----------------------------------------------------------///
> What are amps, watts, volts and ohms?
>
> Inside This Article
> 1. What are amps, watts, volts and ohms?
> 2. Electrical Efficiency
> 3. Lot More Information
> 4. See all Physical Science Article
>
> The three most basic units in electricity are voltage (*V*), current (*I*,
> uppercase "i") and resistance (*r*). Voltage is measured in volts, current
> is measured in *amps* and resistance is measured in ohms.
>
> [image: power lines]
> Karl Weatherly
> *More voltage in an electrical system makes more current flow.*
>
> A neat analogy to help understand these terms is a system of plumbing
> pipes.
> The voltage is equivalent to the water pressure, the current is equivalent
> to the flow rate, and the resistance is like the pipe size.
>
> There is a basic equation in electrical engineering that states how the
> three terms relate. It says that the current is equal to the voltage
> divided
> by the resistance.
>
> *I = V/r*
>
> Let's see how this relation applies to the plumbing system. Let's say you
> have a tank of pressurized water connected to a hose that you are using to
> water the garden.
>
> What happens if you increase the pressure in the tank? You probably can
> guess that this makes more water come out of the hose. The same is true of
> an electrical system: Increasing the voltage will make more current flow.
>
> Let's say you increase the diameter of the hose and all of the fittings to
> the tank. You probably guessed that this also makes more water come out of
> the hose. This is like decreasing the resistance in an electrical system,
> which increases the current flow.
>
> Electrical power is measured in *watts*. In an electrical system power
> (*P*)
> is equal to the voltage multiplied by the current.
> *P = VI*
>
> The water analogy still applies. Take a hose and point it at a waterwheel
> like the ones that were used to turn grinding stones in watermills. You
> can
> increase the power generated by the waterwheel in two ways. If you
> increase
> the pressure of the water coming out of the hose, it hits the waterwheel
> with a lot more force and the wheel turns faster, generating more power.
> If
> you increase the flow rate, the waterwheel turns faster because of the
> weight of the extra water hitting it.
>
> On the next page, we'll talk more about electrical efficiency.
>
> ///----------------------------------------------------------///
>
> On 10/9/07, berry rida <[EMAIL PROTECTED] <berry_iid%40yahoo.co.id>>
> wrote:
> >
> >
> >
> > jungkiwenas <[EMAIL PROTECTED] <jungkiwenas%40gmail.com><jungkiwenas%
> 40gmail.com>> wrote: harus
> > dikali cos phi baru jadi watt klo hanya arus kali amper baru dapet VA
> > klo DC iya bener begitu
> > thx
> > regads
> >
> > Masih belum selesai juga ya bahas topik ini....
> > apa gak ada tema lain apa yang lbh pnting dari pada
> > ini.............aneh!!!!!!!!!!!!!
> > forum IT ????????????????
> >
> > ---------------------------------
> > Bergabunglah dengan orang-orang yang berwawasan, di bidang Anda di
> Yahoo!
> > Answers
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> [Non-text portions of this message have been removed]
>
>
>
[Non-text portions of this message have been removed]
--
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