The discussion revolves around the concept of capacitance in the context of a capacitor connected to a power supply. The original poster presents a scenario involving a 2.50 μF capacitor and questions why its capacitance remains unchanged when the voltage is increased from 9.30 V to 12.30 V.
Participants are actively engaging with the conceptual aspects of capacitance, with some providing insights that capacitance is determined by the physical properties of the capacitor rather than the voltage applied. There is a recognition of the distinction between charge and capacitance in the context of the discussion.
There is an ongoing exploration of the fundamental definitions and relationships in capacitor behavior, with participants reflecting on their understanding of the relevant equations and concepts.
Why do you think it should? If you had a 10 ohm resistor across the power supply would you expect it to become 11 ohms if you increased the voltage?PlatoDescartes said:The answer is 2.5 μF still, but WHY doesn't the capacitance change when the voltage changes?
According to the equation Q=VC, if voltage increases, capacitance should too... I'm missing something here... I apologize!phinds said:Why do you think it should? If you had a 10 ohm resistor across the power supply would you expect it to become 11 ohms if you increased the voltage?
Capacitance is not dependent on voltage nor charge though, only material/geometry. Which is why it doesn't change.PlatoDescartes said:According to the equation Q=VC, if voltage increases, capacitance should too... I'm missing something here... I apologize!