0
Why it is useful to use rms notation for alternating current and voltage?
Wiki User
∙ 10y ago
AC waveform is sinusoidal waveform it has both positives and negative cycles so we dont have a standard constant value to do Measurements so instead of using AC quantities we use ROOT mean square values which is obtained by dividing Vpp(peak to peak voltage) by 1.414
AnswerThe rms-value of an AC current is the same as as the value of DC current that will do the same amount of work. For example, 10 A (rms) AC will do exactly the same amount of work as 10 A DC.Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What are the two kinds of voltage?
There are two types of voltage: 1. AC 2. DC It's hard to answer what 'Types' of voltage there are. It is measured in volts and can span anywhere from zero to almost infinity. Useable voltages can be roughly zoned. From zero up to 1 volt. = Signal voltage. 1.5v to 36v = Low voltage for electronics and consumer items. 48v to 240v = High voltage for domestic applications in the home. 280 to 512v = High voltage used for industrial machines. 1KV to 400Kv= Very high voltage for transmission over distance. AC (Alternating current) is made using a spinning generator. It is the only type of current that can be transformed easily from one volktage to another using a transformer. DC (Direct current) is normally made using batteries, but can also be made using a generator with a commutator and brush gear. Very hard to change voltage, but useful at low voltages for electronics.
Why you used Alternating current in gas tungsten arc welding?
A couple primary reasons. 1 the current reversing itself helps to break up oxides on the surface of the metal. 2 Alternating current produces more heat in the arc which is useful in welding aluminum because heat dissipation is rapid in this metal.
Why we use rms value of current why not simple value of current?
RMS (root mean square) is often used as opposed to the peak to peak value because it expresses the actual power for AC systems. For example, your actual home voltage is closer to 170 volts peak - neutral. Say you have 1/2 Amp peak -neutral current flowing. Actual power is equivalent to:P = Vrms*Irms; RMS = Vpeak-neutral/sqrt(2)P = 1/2 * (Vpeak-neutral) * (Ipeak-neutral).You can quickly see that discussing wire size, fuse sizing, breaker sizing, etc. in terms of peak - neutral or peak- peak volts / currents, will quickly become more complicated than it needs to be.This is also a more useful value from a usage standpoint, as you will be charged for the power you use.
Why is alternating current more convenient than a direct current?
The main advantage offered by using alternating current is that it is easy to achieve the transmission of large amounts of power over very long distances and to do it much more cheaply than by using direct current.The most efficient way to transmit energy by wire is to make it low current and high voltage. AC voltage can be transformed very easily with Transformers (called stepping-up and stepping-down), and transformers only work with AC.Powerplants produce AC by default, so it would take additional effort to convert it to DC.It is much easier and cheaper to convert AC to DC than to convert DC to AC.Another answerAn AC voltage can be easily transformed to a higher or lower voltage, with very little loss of power, by passing it through a device known as a transformer.Alternating current can be converted into direct current very easily so that dc can be made available to any equipment which needs it.
What is zener break down voltage?
The point in the forward operating region of the characteristic curve where conduction starts to increase rapidly is called Knee voltage of a PN Junction Diode.The breakdown voltage of a diode is the minimum reverse voltage to make the diode conduct in reverse.(or) Breakdown voltage is a parameter of a diode that defines the largest reverse voltage that can be applied without causing an exponential increase in the current in the diode.-- Dinakar
What is one way that alternating current is more useful than direct current-?
alternating current is easier to transfer long distances
What are the functions of power pack?
the power pack converts direct current into alternating current useful the pc
What is one way that alternative current is more useful than direct current?
alternating current is easier to transfer long distances
Can we produce electricity from lightning?
No. Lightning is a DC discharge of short duration at a very high voltage. To be useful for commercial production it has to be a continuousness alternating current (AC) supply of voltage. Only AC supplies can be manipulated to be boosted to a higher voltage for transmission and then lowered for use by transformation to lower home voltages.
How Does a 24V Switching Power Supply Work?
A 12V switching power supply is an electronic device that converts high-frequency alternating current (AC) to low voltage direct current (DC) that can be useful for powering electronic devices that require low voltage DC power, such as LED lights, home appliances, and computers.
What is one way that alternating current is more useful than dirrect current?
Less loss when transmitting over long distances.
What are the two kinds of voltage?
There are two types of voltage: 1. AC 2. DC It's hard to answer what 'Types' of voltage there are. It is measured in volts and can span anywhere from zero to almost infinity. Useable voltages can be roughly zoned. From zero up to 1 volt. = Signal voltage. 1.5v to 36v = Low voltage for electronics and consumer items. 48v to 240v = High voltage for domestic applications in the home. 280 to 512v = High voltage used for industrial machines. 1KV to 400Kv= Very high voltage for transmission over distance. AC (Alternating current) is made using a spinning generator. It is the only type of current that can be transformed easily from one volktage to another using a transformer. DC (Direct current) is normally made using batteries, but can also be made using a generator with a commutator and brush gear. Very hard to change voltage, but useful at low voltages for electronics.
What detrimental effects does inductance have on the current in an alternating current?
In inductive circuits the current phase lags behind the voltage phase. The phase difference between current and voltage can mean you can get heavy currents flowing that aren't doing useful work, yet contribute to wasted power if they flow in other parts of the circuit (or even in surrounding metal screens etc) . In some circuits, such as tuned circuits, inductance is an important feature so resistive components have to be avoided there.
What detrimental effect does inductance have on the current in an alternating current circuit?
In inductive circuits the current phase lags behind the voltage phase. The phase difference between current and voltage can mean you can get heavy currents flowing that aren't doing useful work, yet contribute to wasted power if they flow in other parts of the circuit (or even in surrounding metal screens etc) . In some circuits, such as tuned circuits, inductance is an important feature so resistive components have to be avoided there.
Why you used Alternating current in gas tungsten arc welding?
A couple primary reasons. 1 the current reversing itself helps to break up oxides on the surface of the metal. 2 Alternating current produces more heat in the arc which is useful in welding aluminum because heat dissipation is rapid in this metal.
How does a metal halide ballast work?
A metal halide ballast works just by transforming the line voltage into much more useful voltage to the metal halide, and by regulating the current so that the bulb will have its useful life at the most.
How is Ohm's law useful?
Ohm's Law relates Voltage, Current, and Resistance. The equation is Voltage = Current times Resistance. Knowing any two, you can figure out the third, and that is one of the principles of basic circuit analysis.
