What is the origin of the capacitance formula?
Nov 23, 2016 · Everyone knows capacitance is defined as C = Q/V, but why? Sure I understand the utility of it and its use, but can someone provide a motivation or historical context for this …
Intuition for voltage on a capacitor in series LC circuit
May 26, 2025 · But given that the entire charge Q is on the capacitor now, with conservation of charge Q = CV. So we get $$ V1* (CV) = \frac {1} {2}CV^2$$ . This forces V to be 2V1. Edit 1: …
Why exactly is capacitance equal to both Q/V and εA/d?
Feb 10, 2025 · I understand that capacitance is just a coefficient attached to a given capacitor and describes how much charge is required to increase the potential difference across the plates, …
theory - Electrical Engineering Stack Exchange
Jan 25, 2024 · Yes Q and V are the same, but obviously you cannot substitute a quantity with its d/dt'ed form
Deriving the formula from 'scratch' for charging a capacitor
Oct 18, 2016 · Current is the rate of change of charge. Taking a derivative of both sides of Q=CV then gives us I=cdV/dt. Then work the equation from there.
Inductor equivalent of capacitor's charge - Electrical Engineering ...
May 6, 2013 · Q = CV for a capacitor and for an inductor the equivalent might be Ampere-turns or H. It's going to be something related to current and inductance possibly but nothing rings a bell.
Is the capacity of a capacitor in an RC circuit independent of time?
Apr 22, 2020 · If your ideal circuit uses an ideal capacitor then yes, that capacitance will be constant. This is simply by our definition of the ideal capacitor element. Having said that, there …
LC circuit with 2 capacitors, one charged, one uncharged
But what about at the initial conditions? If just one is charged then Q=CV. But in parallel, then Q=2CV, which adds extra charge to the system. Can anybody explain this to me or provide a …
What is the charge stored in the equivalent capacitance?
Oct 8, 2023 · Charge stored across this is Q = CV = 2.8 * 80/7 = 32 micro coulombs. But if you calculate charges stored for the individual capacitances and add them up, it comes as 36 …
What makes the charge on a capacitor change?
The remainder of your question is based on this incorrect (or contradictory) premise. Q = CV and the rate of change of Q (dQ/dt) = C dV/dt. This of course equals current because rate of …