- #1
symsane
- 13
- 0
I know that voltage of a capacitor is continuous. However, I want to learn that; can it be a jump in the capacitor voltage? Also, if it is, how it can be happened?
In summary, the conversation discusses the concept of voltage in a capacitor and whether it can have a jump or instantaneous increase. The speakers agree that in classical physics, a jump in voltage is not possible as it would require infinite current. However, in the quantum mechanical case, the effect of quantization on the flow of electrons is considered. It is also noted that while a step function voltage can charge a capacitor very quickly, it still takes some time and is not instantaneous.
- #2
atyy
Science Advisor
- 15,168
- 3,374
Classically, to charge a capacitor requires current. To charge a capacitor in zero time requires infinite current, which is not possible. I could imagine that if the charging were very fast, it might be reasonable to approximate it as an instantaneous jump in voltage.
But charge is quantized. I wonder what happens in the quantum mechanical case.
But charge is quantized. I wonder what happens in the quantum mechanical case.
- #3
Naty1
- 5,606
- 40
charge on a capacitor is given by q = CV...there is superficially no time here ...BUT
atyy's explanation is a good one: charge is the result of the flow of electrons which have have finite, not instantaneous speed...in fact charge in coulombs is given by q=it...amps times time...so in this formulation you can see...charging takes some "t"...
in fact a step function (square wave) voltage will charge it really,really,fast...but not instantaneously...
atyy's explanation is a good one: charge is the result of the flow of electrons which have have finite, not instantaneous speed...in fact charge in coulombs is given by q=it...amps times time...so in this formulation you can see...charging takes some "t"...
in fact a step function (square wave) voltage will charge it really,really,fast...but not instantaneously...
1. What is "Jump In The Capacitor Voltage"?
"Jump In The Capacitor Voltage" refers to a phenomenon in which the voltage across a capacitor suddenly increases or decreases by a significant amount. This can occur due to a sudden change in the current flowing through the capacitor or a change in the capacitance of the capacitor itself.
2. What causes a jump in capacitor voltage?
A jump in capacitor voltage can be caused by a variety of factors, including a sudden change in the circuit's current, a change in the capacitance of the capacitor, or the introduction of a high voltage pulse. It can also occur due to a faulty or damaged capacitor or circuit component.
3. How does a jump in capacitor voltage affect the circuit?
A jump in capacitor voltage can have various effects on a circuit, depending on the circuit's design and purpose. In some cases, it can lead to a disruption or malfunction of the circuit, while in others, it may be a desired effect, such as in a voltage multiplier circuit.
4. Can a jump in capacitor voltage be prevented?
In some cases, a jump in capacitor voltage can be prevented by using a properly sized capacitor and designing the circuit to handle sudden voltage changes. Additionally, using surge protectors or snubber circuits can help protect the capacitor from sudden voltage spikes.
5. How is a jump in capacitor voltage measured?
A jump in capacitor voltage can be measured using a voltmeter or oscilloscope. The voltage across the capacitor can be monitored before and after the jump to determine the magnitude of the change and the duration of the jump. This information can then be used to analyze and troubleshoot the circuit.
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