# Parallel resonance by varying frequency

• Toyona10
In summary, at the resonant frequency, the current in the inductor and capacitor increases, leading to high voltage levels at parallel resonance. This high circulating current is responsible for the voltage peak, with very little current being drawn from the external circuit.
Toyona10
I understood how it responds by varying the other parameters (L , C...) but how does it respond to changes in frequency? (Honestly speaking, I barely get a thing they're trying to say in my textbook)

What do you mean by changing the frequency?
You change the loads (resonant) frequency by changing L, R, C etc.
You change the source frequency by changing the frequency of the A.C. input.
When they match resonance occurs.

Toyona10 said:
I understood how it responds by varying the other parameters (L , C...) but how does it respond to changes in frequency? (Honestly speaking, I barely get a thing they're trying to say in my textbook)
At the resonant frequency, the current in L (and the current in C) can reach high values, therefore the voltages across those elements can become high. (High in comparison to the values well away from the resonant frequency.) Where does this high current come from, because the current drawn from the external circuit actually becomes minimal at resonance.

The current in the inductor comes from the capacitor, and the current in the capacitor comes from the inductor, and very little current is drawn from the external circuit at resonance. It is this high circulating current between L and C that is responsible for the high peak in voltage levels at parallel resonance.

## 1. What is parallel resonance?

Parallel resonance is a phenomenon that occurs in an electrical circuit when the inductive reactance and capacitive reactance are equal. This results in a high current and low impedance in the circuit, allowing it to easily absorb and release energy.

## 2. How is frequency varied in parallel resonance?

In parallel resonance, frequency is varied by adjusting the value of the capacitance or inductance in the circuit. This can be done by changing the physical components or by using a variable capacitor or inductor.

## 3. What are the applications of parallel resonance?

Parallel resonance has many practical applications, such as in radio frequency circuits, filters, and power factor correction. It is also used in electronic devices like televisions, radios, and computers.

## 4. What happens to voltage in parallel resonance?

In parallel resonance, the voltage across the circuit is at its maximum value. This is because the impedance of the circuit is at its minimum, allowing more current to flow through the circuit and resulting in a higher voltage.

## 5. How does parallel resonance affect power transfer?

Parallel resonance can significantly affect power transfer in a circuit. When a circuit is in parallel resonance, the current and voltage are in phase, which results in a high power factor. This means that more power can be transferred efficiently through the circuit.

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