JEE Main & Advanced Physics Alternating Current Wattless Current Such a circuit is called the wattless circuit and the current flowing is called the wattless. Wattless Current – Wattless Current – Alternating Current Video Class – Alternating covering Power of Alternating Current Circuit, Alternating Current Generator. Current flowing through an ac circuit in which power consumed is zero is called wattless an a.c. (alternating current) circuit, there are two components.

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Typically this will consist of either just a capacitor relying on parasitic resistance and inductance in the supply or a capacitor-inductor network.

This method of calculating the average power gives the active power regardless of harmonic content of the waveform. While active power and reactive power are well defined in any system, the definition of apparent power for unbalanced polyphase systems is considered to be one of the most controversial cufrent in power engineering.

Verification Code Sent Successfully. This is the fundamental mechanism for controlling the power factor in electric power transmission; capacitors or inductors are inserted dattless a circuit to partially compensate for reactive power ‘consumed’ ‘generated’ by the load. A capacitor is an AC device that stores energy in the form of an electric field. The simplest way to get that result is to take the integral of the wattelss calculation over the desired period:.

Definition of wattless current – glossary

Answered by Expert 5th March6: Back to Log in. From Wikipedia, the free encyclopedia. It is zero when the current leads or lags the voltage by 90 degrees.

Please login back to continue to your studies. For two systems transmitting the same amount of active power, the system with the lower power factor will have higher circulating currents due to energy that returns to the source from energy storage in the load. Power factors are usually stated as “leading” or “lagging” to show the sign of the phase angle of current with respect to voltage.


To distinguish reactive power from active power, it is measured in units of ” volt-amperes reactive “, or var. Thus, stopping potential is independent of the incident radiation.

To get the best experince using TopperLearning, we recommend that you use Google Chrome. By using shunt resistance what are we doing in the conversion of galvanometer to ammeter.

Definition of wattless current

In a simple alternating current AC circuit consisting of a source and a linear load, both the current and voltage are sinusoidal. The unit for reactive power is expressed as var, which stands for volt-ampere reactive. Arc-fault circuit interrupter Earth leakage circuit breaker Residual-current device GFI Power-system protection Protective relay Digital protective currenf Sulfur hexafluoride circuit breaker.

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Therefore, for a perfect resistor. The current required for this reactive power flow dissipates energy in chrrent line resistance, even if the ideal load device consumes no energy itself.

The result of curfent is that capacitive and inductive circuit elements tend to cancel each other out. Since an RMS value can be calculated for any waveform, apparent power can be calculated from this. With what speed did he cover the second part of the journey? The power flow has two components – one component flows from source to load and can perform work at the load; the other chrrent, known as “reactive power”, is due to the delay between voltage and current, known as phase angle, and cannot do useful work at the load.

If X is defined as being positive for an inductor and negative for a capacitor, then we can remove the modulus signs from S and X and get. Please login back to continue to your studies.


Asked by gargtanya 9th November This is done such that a leading current capacitive load, negative reactance results in negative reactive power. Voltage levels and reactive power flow must be carefully controlled to allow a power system to be operated within acceptable limits.

ContinueI understand this browser is not compatible. However, with the development of three phase power distribution, it became clear that the definition of apparent power and the power factor could not be applied to unbalanced polyphase systems. Reactive power flow strongly influences the voltage levels across the network. A new definition based on Symmetrical components theory was proposed in by Alexander Emanuel for unbalanced linear load supplied with asymmetrical sinusoidal voltages:.

In this case, only reactive power flows: There is no net energy flow over each half cycle. Please subscribe to post the question. When there is inductance or watless in the circuit, the voltage and current waveforms wattoess not line up perfectly. Your session has expired for security reasons or you may have logged in from another location. An Email has been sent with your login details Log In.

Asked by Nimmi 9th November The committee found no consensus and the topic continued to dominate discussions. You been logged out of current session. These units can simplify to Watts, but are left as var to denote that they represent no actual work output. Trending Tags integration problems on integration integration examples linear equations integration by substituion quadratic equation trigonometric ratios distance time original fraction.

Calculate his average speed for the wsttless journey. Enter your valid mobile number below.