Question

In an $L-C-R$ circuit, at resonance

• A. the current and voltage are in phase
• B. the impedance is maximum
• C. the current is minimum
• D. the current leads the voltage by $\pi/2$

Answer 1

The Correct Option is A

Key concept Resonance occurs in a series
$L-C-R$ circuit, when $X_{L}=X_{C}$ or $\omega_{r}=\frac{1}{\sqrt{L C}}$.
In an $L-C-R$ circuit at resonance the current and voltage are in phase.

Answer 2

Ans. The LCR circuit can function independently as an inductor, a resistor, or a capacitor. The voltage that flows through each of the circuit's constituent components can likewise be increased using the LCR circuit. This voltage can be substantially higher than the voltage that is applied to the circuit outside. Additionally, LCR circuits can be used to alter the circuit's impedance and resistance to various frequencies of current. To achieve the required effects in electrical devices, any of these effects can be utilized singly or in combination.

Resistor: The resistor restricts the passage of current. It aids in regulating the voltage or power supplied to the LCR circuit. One part of an electronic device that restricts the flow of electric current is the resistor. The resistor aids in regulating the voltage or power supplied to the LCR circuit. This is crucial because it keeps the other parts of the circuit from receiving excessive current.

Capacitor: A capacitor helps regulate the voltage or power delivered to the LCR circuit by storing energy and releasing it in a regulated manner. The L resistor is shielded from excessive current flow by the capacitor, which stores energy and releases it gradually.An inductor helps to regulate current flow variations by resisting changes in the current flow. The LCR circuit is stabilized by the inductor, which resists changes in current flow. To control the amount of light emitted by electronic devices like computers, TVs, and smartphones, the LCR circuit is a component of these gadgets.