Ac Theory Level 3 Lesson 1 (2024)

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Ac Theory Level 3 Lesson 1 (2024)

FAQs

What is the power factor for a purely capacitive circuit is always percent? ›

The power factor is the cosine of the angle of the impedance. Since a pure capacitive circuit has no real component of the impedance, then the power factor is 0.

When viewing the sine wave of a purely capacitive circuit, which of the following lags the current? ›

Looking at the graph, the current wave seems to have a “head start” on the voltage wave; the current “leads” the voltage, and the voltage “lags” behind the current. Voltage lags current by 90° in a pure capacitive circuit.

Is 100 of the apparent power used or consumed in a purely resistive circuit? ›

Therefore, it is true that 100% of the apparent power is used or consumed in a purely resistive circuit. This is not the case in circuits that have reactive elements, such as inductors and capacitors, where the current and voltage are out of phase with each other.

When voltage and current are displayed on a sine wave curve representing a pure inductive circuit, the current lags the voltage by ________.? ›

Current lags voltage by 90° in a pure inductive circuit. Things get even more interesting when we plot the power for this circuit: In a pure inductive circuit, instantaneous power may be positive or negative.

What is the formula for power factor? ›

PF = kW / kVA

A steel stamping operation runs at 100 kW (Working Power) and the Apparent Power meter records 125 kVA. To find the PF, divide 100 kW by 125 kVA to yield a PF of 80%. This means that only 80% of the incoming current does useful work and 20% is wasted through heating up the conductors.

How to tell if load is inductive or capacitive? ›

If both inductors and capacitors are present then simply find the equivalent impedance of the load network. If the imaginary part of the equivalent impedance is positive then the load is inductive, if it is negative then it is capacitive, and if it is zero then it is resistive.

What is the power factor of a purely resistive load in a three-phase AC circuit? ›

Power Factor Values

For the purely resistive circuit, the power factor is 1 (perfect), because the reactive power equals zero. Here, the power triangle would look like a horizontal line, because the opposite (reactive power) side would have zero length.

What is the formula for capacitance in an AC circuit? ›

Capacitance is measured in Farad (F) and is given by the formula: C = Q/V. A higher value means the capacitor is able to store more electric charges when a voltage is applied. Capacitance is a value that electronics designers pay attention to in both DC and AC circuits.

What is the relationship of current and voltage in a purely capacitive circuit? ›

In a pure capacitive circuit, the correct phase relationship is that the current leads the voltage by 90 degrees, remembering that it is opposite to an inductive circuit where the voltage leads.

What is the formula for reactive power in an AC circuit? ›

The reactive power formula is Q = V × I × sin(φ), where Q is the reactive power, V is the voltage, I is the current, and φ is the phase angle between the voltage and the current. The power factor is crucial in the reactive power formula, as it affects the amount of reactive power required to sustain the circuit.

What are the combined effects of resistance, inductive reactance, and capacitive reactance? ›

The combined effect of resistance R, inductive reactance XL, and capacitive reactance XC is defined to be impedance, an AC analogue to resistance in a DC circuit. Current, voltage, and impedance in an RLC circuit are related by an AC version of Ohm's law: I0=V0Z or Irms=VrmsZ I 0 = V 0 Z or I rms = V rms Z .

What is reactive power also known by? ›

This “phantom power” is called reactive power, and it is measured in a unit called Volt-Amps-Reactive (VAR), rather than watts. The mathematical symbol for reactive power is (unfortunately) the capital letter Q.

What is the behavior of inductor in AC circuit? ›

A coil (inductor) passes direct current smoothly, but presents a resistance to alternating current. The resistance increases towards higher frequencies. This effect is called the inductive reactance (XL) of the coil. The following relationship exists between the alternating current frequency (f) and the inductance (L).

What is the Behaviour of AC through pure inductance only? ›

As the current changes direction, it periodically reverses the voltage in the AC circuits. Hence, in the AC Circuit containing inductance only, the current lags the voltage by 90°. When the AC circuit consists of only the inductor, it helps store the electric current in the form of the magnetic field.

What is the symbol for inductive reactance? ›

The quantity ImωL represents the maximum voltage across the inductor (at t=0). The quantity L is known as an inductive reactance, and it is a measure of resistance to alternating current. Ohms are used to measure inductive reactance. The symbol XL represents inductive reactance.

What is the power factor of a capacitive circuit always? ›

In a purely capacitive circuit, the current leads the voltage by 90° and the power factor is zero leading.

What is the power in a purely capacitive circuit? ›

Assertion (A) : In purely capacitive AC circuit, average power consumed is zero. Reason (R) : The phase difference between the current and voltage in case of a purely capacitive circuit is 90∘.

What is the percentage of power factor? ›

PF expresses the ratio of true power used in a circuit to the apparent power delivered to the circuit. A 96% power factor demonstrates more efficiency than a 75% power factor. PF below 95% is considered inefficient in many regions.

What is the power factor of a capacitive load? ›

Therefore power factor in inductor = 0 lag. In a capacitor current leads the voltage by 90°. Therefore “theta”=90°, hence P=0. Therefore power factor in capacitor =0 lead.

References

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