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It depends on the frequency in the expression of the function. A third harmonic would mean that the frequency is 3 omega, thus the circuit will consist only of the quantities that have 3 omega in the expression. For example if you have :
e(t)=5sin(3ωt+π/4) and is(t)=7sin(ωt+π/4), in the first harmonic the e(t) quantity
will disappear from the circuit while in the third harmonic the is(t) quantity will be neglected.
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∙ 13y ago
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What are the main difference while applying kirchoffs laws to dc circuits and ac circuits using meter readings?
For DC circuits, an alebraic sum is required. For AC circuits, a phasor sum is required.
Why even harmonics are not present in push pull amplifier?
Symmetrical push/pull circuits must cancel even ordered harmonics, like f2, f4, f6 and therefore promote odd ordered harmonics, like (f1), f3, f5 when driven into the nonlinear range.
Can resistors function the same in AC circuits as in DC circuits?
Yes, they both can add a load to a circuit.
What is the fundamental frequency?
For a waveform containing harmonics, the harmonic frequencies are multiples of what is known as the 'fundamental' frequency. For example, for a waveform that contains 'third harmonics', the fundamental frequency is one-third the frequency of the harmonics. The fundamental frequency of vocal folds the speech mechanism as sound generator.
What is the opposition of current flow measured in?
The opposition of current flow is measured in ohms. For DC circuits it is resistance and for AC circuits it is impedance.
Why even harmonics do not exits in ac machines?
Because the resulting voltage waveform is symmetric about the center of the rotor flux, no even harmonics are present in the phase voltage.
What are the main difference while applying kirchoffs laws to dc circuits and ac circuits using meter readings?
For DC circuits, an alebraic sum is required. For AC circuits, a phasor sum is required.
What statements is not true for AC?
Ohm's law does not apply to AC circuits.
Why even harmonics are not present in push pull amplifier?
Symmetrical push/pull circuits must cancel even ordered harmonics, like f2, f4, f6 and therefore promote odd ordered harmonics, like (f1), f3, f5 when driven into the nonlinear range.
What are disadvantages of harmonics?
harmonics increase heating of motors ,transformers and capacitors .Power system protecting relays may operate falsly, meters give inaccurate readings,interference with telephone lines may also occur. Moreover resonance due to harmonics also causes problems
What is difference between overtone and harmonics?
The first harmonic is the fundamental. The second harmonic the first overtone. The third harmonic the second overtone. The fourth harmonic the third overtone. Even-numbered harmonics are odd-numbered overtones. Odd-numbered harmonics are even-numbered overtones.
What is the use of capacitor in dc circuits?
It will minimize curent flutuations, it olso helps in AC circuits( in AC I tink it absorbs frequenci emmisions).
What does ac stand for in circuits?
alternating current
What is the 3rd harmonics in transformer?
The third harmonic is tree times the fundamental frequency.
Can resistors function the same in AC circuits as in DC circuits?
Yes, they both can add a load to a circuit.
Transformer are used in circuits containing both dc and ac?
No transformers only work with AC.
Does meter loading in ac circuits depend on frequency?
yes
