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What is it mean to say that an alternating current leads or lags an alternating emf?
Wiki User
∙ 13y ago
It is another way of saying that the circuit is capacitive reactive circuit. Look up the mnemonic ELI the ICE man. ELI, voltage leads the current in an inductive circuit. ICE, current leads the voltage in a capacitive circuit.
Wiki User
∙ 13y ago
Anonymous
Current reaches the peak value before alternating emf
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How do you shift an ac phase?
It really does depend upon what you mean by 'shift'. For purely-resistive circuits, the load current is in phase with the supply voltage. For reactive circuits, the load current will lead or lag the supply voltage; for capacitive-resistive circuits, the load current leads, whereas for inductive-resistive circuit, the load current lags. You can change the angle by which the current leads or lags (the 'phase angle') by changing the amount of resistance or reactance.
What is the reactance of a 25 uf capacitor when the applied frequency is 400 hz?
Reactance is -1/2 pi F C so a 25 uF capacitor at 400 Hz would have a reactance of about -15.9 ohms. The negative sign indicates that capacitive reactance is leading, with current leading voltage.AnswerI would take issue with the previous answer that capacitive reactance is expressed as a negative value, or that it is 'leading'. Reactance is not a vector quantity, so it neither leads nor lags anything. In a (theoretically) purely capacitive circuit, it is the load current that leads the supply voltage. However, when using complex notation, capacitive reactance is expressed as -j 15.9 ohms, where 'j' is called an 'operator' -but even this does not mean that the reactance is 'leading', as it defines reactance in terms of a current phasor -in other words, the '-j' refers to the relative position of current to voltage, not reactance to impedance.
How do you isolate magnetism remaining in the core of a electromagnet after the coil current is removed?
Your question is confusing, as you do not explain what you mean by 'isolate'. If you mean 'allow the core to retain some magnetism', then this will always be the case when the current through the coil is reduced to zero. In order to remove this 'residual magnetism', you will need to reverse the direction of current through the coil. This is a feature of what is known as 'hysteresis', by which changes in the flux density of a core 'lags behind' changes to the magnetic field strength that creates it.
What is the different between rms current and dc current?
Root-mean-square (r.m.s.) values are applied to alternating currents and voltages. The r.m.s. value of an a.c. current and a d.c. current of the same value will both do exactly the same amount of work. For example, 10 A (r.m.s.) is exactly equivalent to 10 A d.c. because they will both do exactly the same amount of work.
What do a direct electrical current is different from an alternating current because only the direct electrical current means?
In Direct Current, electrons flow from the negative pole of the electrical source, through the load, to the positive pole of the electrical source. Current is constant as there are no variations in voltage over time in the circuit. Voltage and current are measured by directly measuring the voltage and current in the circuit. In Alternating Current, electrons also flow from the negative pole of the electrical source, through the load, to the positive pole of the electrical source. However, the polarity of the poles changes +/- to -/+ to +/- , alternating polarity over and over again. This causes the direction of the electrons in the circuit to change each time the source poles change polarity. Current and voltage are not constant in an AC circuit as they vary with the waveform generated by the electrical source. In many, but not all cases, voltage and current are measured by the RMS (root-mean-square) method as directly reading the peaks of the AC waveform will not indicate the correct amount of energy in the circuit.
How do you shift an ac phase?
It really does depend upon what you mean by 'shift'. For purely-resistive circuits, the load current is in phase with the supply voltage. For reactive circuits, the load current will lead or lag the supply voltage; for capacitive-resistive circuits, the load current leads, whereas for inductive-resistive circuit, the load current lags. You can change the angle by which the current leads or lags (the 'phase angle') by changing the amount of resistance or reactance.
What is AC voltage terminology - in phase - mean?
If the current rises and falls with the voltage, then the two are said to be 'in phase'; this occurs in a purely-resistive circuit. For inductive or capacitive circuits, the current either lags or leads the voltage.
What does the term rectifier mean?
An electrical device that converts alternating current to direct current is known as a rectifier. An inverter is a device that converts direct current to alternating current.
What does A.C.E MEAN?
Depending on how it's used, it can mean air conditioning, or it can mean alternating current (as electrically powered) as opposed to battery powered (DC, which is direct current). Or Animal Crossing
What is mean by rectifier?
It converts AC (Alternating current) into DC (Direct current)
What does a c in a car mean?
air conditionning no Alternating current
What does 115 vac mean?
115 volts alternating current
What does AC mean about current flow?
AC means Alternating Current. Alternating Current changes direction constantly, usually at 60Hz (US, Canada, and others) or 50Hz (UK and others).
What does kvac mean?
K = kilo = 1000's V = volts AC = alternating current So, 12 KVAC is 12,000 volts of alternating current
What do -ac mean?
It mean air condition... It mean alternating current too... and Atlantic city
What is the mean by the word A'C in electical system?
AC refers to Alternating Current, as opposed to DC which is Direct Current.
Can alternative current be turned into direct current?
By "alternative" I presume you mean "alternating". Yes it can by using a device called a rectifier then some sort of bypass circuit to conduct the alternating current to ground, usually just a capacitor.
