Voltage across a capacitor

In summary, the maximum voltage across a capacitor in an L,R,C series circuit depends on the input current, whether it is AC or DC. For DC, the voltage across the capacitor will be equal to the supply voltage. For AC, it will depend on the frequency of the supply voltage and the impedance of the LRC circuit, which is determined by the values of the components. This voltage will change over time since the supply voltage varies in frequency.
  • #1
Ed Quanta
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How do you calculate the maximum voltage across a capacitor in an L,R,C series circuit?
 
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  • #2
It depends on the input current, is it AC or DC?

If DC then Vc=Vcc (V across cap=supply )
If AC then it depends on the Fq of Vcc and the impedance of the LRC circuit. ( which is a characteristic of their respective values)
Where: Z= Sqrt (R^2 * ((Xl-Xc) ^2))
WhereXl is inductive reactance and Xc is capacitive reactance

The answer will be a point in time of a value that changes over time. In other words since Vcc varies over time (Fq) so will the voltage over time.
 
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  • #3


The maximum voltage across a capacitor in an L,R,C series circuit can be calculated using the formula Vmax = Q/C, where Vmax is the maximum voltage, Q is the charge on the capacitor, and C is the capacitance of the capacitor. This formula is derived from the equation V = Q/C, which represents the relationship between voltage, charge, and capacitance.

In an L,R,C series circuit, the maximum voltage across the capacitor occurs when the current in the circuit is at its peak and the capacitor is fully charged. This can be calculated using the equation I = V/R, where I is the current, V is the voltage, and R is the resistance. Once the current is known, the charge on the capacitor can be calculated using the equation Q = I*t, where t is the time it takes for the capacitor to fully charge.

Once the charge on the capacitor is known, the maximum voltage can be calculated using the formula Vmax = Q/C. It is important to note that the maximum voltage across a capacitor in an L,R,C series circuit will depend on the values of the inductance (L), resistance (R), and capacitance (C) in the circuit.
 

What is voltage across a capacitor?

Voltage across a capacitor refers to the potential difference between the two plates of the capacitor. It is a measure of the electrical energy stored in the capacitor and is measured in volts.

How is voltage across a capacitor calculated?

The voltage across a capacitor can be calculated using the formula V = Q/C, where V is the voltage, Q is the charge stored on the capacitor, and C is the capacitance of the capacitor.

What happens to the voltage across a capacitor in a DC circuit?

In a DC circuit, the voltage across a capacitor remains constant once the capacitor is fully charged. This is because a capacitor acts as an open circuit in a DC circuit once it is fully charged.

What is the relationship between voltage across a capacitor and time in an AC circuit?

In an AC circuit, the voltage across a capacitor varies with time. It follows a sinusoidal waveform, where the voltage increases as the capacitor charges and decreases as it discharges.

How does the dielectric material of a capacitor affect the voltage across it?

The dielectric material of a capacitor can affect the voltage across it by changing the capacitance of the capacitor. A higher dielectric constant material will result in a higher capacitance and therefore a higher voltage across the capacitor when the same amount of charge is stored.

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