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What is the phase difference between voltage and current in LR circuit?
Phasor Diagram for RL Circuit In case of resistor, the voltage and the current are in same phase or we can say that the phase angle difference between voltage and current is zero.
What is the phase angle in LC circuit?
With no circuit resistance, there is no resistive voltage, so we simply show the current vector in red, at the reference phase angle of 0°. We know that voltage leads current in an inductance, so we show vL at a phase angle of +90°. We also know that voltage lags current in a capacitance, so we show vC at -90°.
What is the phase relationship between current and voltage across an inductor?
Current lags voltage by 90° in an inductor. Mathematically, we say that the phase angle of an inductor’s opposition to current is 90°, meaning that an inductor’s opposition to current is a positive imaginary quantity.
When does the voltage in an LC circuit oscillate?
It follows that the voltage in an LC circuit oscillates at the same frequency as the current, but with a phase shift of radians. In other words, the voltage is maximal when the current is zero, and vice versa. The amplitude of the voltage oscillation is that of the current oscillation multiplied by .
How is the current in a series circuit?
As in all series circuits the current has the same value at all points. This means the current in the inductor is the same as, and therefore in phase with, the current in the capacitor. The voltage across the inductor leads the current by 90 degrees, and voltage across capacitor lags the current by 90 degrees.
How does a series LC circuit lead to a capacitor?
Since the current through both is the same, the voltage across the inductor leads the voltage across the capacitor by 180 degrees. The circuit vector (phasor) diagram for a series LC circuit is shown in Figure 2 and is constructed as follows:
What happens to the current when C is fully charged?
If we begin at a voltage peak, C is fully charged. Since current is 90° out of phase with voltage, the current at this instant is zero. But C now discharges through L, causing voltage to decrease as current increases. When C is fully discharged, voltage is zero and current through L is at its peak.