Q:

How can you tell if a parallel LC circuit is in resonance?

A:

A parallel LC circuit is in resonance when a current detected through the parallel circuit falls in phase with the supply voltage, according to Electronic-Tutorials. At the point of resonance, a large circulating current can be detected between the inductor and the capacitor because of energy stemming from the oscillations. A parallel resonant circuit holds energy in the inductor’s magnetic field and the capacitor’s electric field.

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A simple parallel resonance or tank circuit experiences resonance when the capacitor’s and inductor’s reactance equal each other. Inductive reactance surges with increase in frequency while capacitive reactance decreases with surging frequency, meaning that the two reactances can equal each other at only one point in an oscillation. When the capacitive reactance matches the inductive reactance at the point of resonance in a parallel LC circuit, the circuit’s sum impedance soars to infinity, meaning that no current is drawn from the AC supply.

According to Value Amrita, the behavior of a parallel LC circuit is utilized in devices such as oscillators, graphics tablets, tuners, mixers, electronic article surveillance and contactless cards. Such a circuit shares some characteristics with a series resonance circuit, with the formula for calculating the resonant frequency being the same in both types of circuits.

Related Questions

• A:

The difference is that a current traveling through a circuit flows constantly through conductors, typically in a low voltage but at a high rate of current. A static discharge is high voltage but low current, and occurs due to a build-up of opposite charges on objects separated by an insulator. This build-up occurs until the charge is so great that the electrons flow though the insulator to balance the charges.

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• A:

Series and parallel resonance are two distinct circuit structures. In a parallel circuit, there is infinite resistance to an alternating current. In a series circuit, there is zero resistance to an alternating current, but only when the greatest possible response to a varying signal occurs. Resonance itself is the maximization or minimization of an electrical current at a particular frequency.

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• A:

Voltage, or electrical pressure, in a system produces a proportionate amount of current when placed across electrical resistance. Ohm's law indicates that 1 volt passed through 1 ohm of resistance produces 1 ampere of current, or electrical flow. Voltage and current, therefore, have a direct relationship most of the time.