Charging a capacitor, Physics

Charging a capacitor:

In the diagram below, all of the resistance in the circuit is added together and shown as a single value R.

495_Charging a capictor.png

With S1 closed and S2 open, the capacitor will charge up.

Note that Kirchhoff's second law always applies, that is:

                   E  =  VR  +  VC

The charging sequence is as follows:

  • On closing S1, no current has yet flowed, the capacitor plates have no charge on them and hence, there is no voltage across it.
  • The whole of the applied voltage is developed across the resistor:

                   VR  =  E

  • The initial charging current is equal to the current through the resistor:  2110_Charging a capictor1.png

  • As C charges, the potential difference across it (VC) increases, opposing the applied voltage (E) so that the charging current is progressively reduced.
  • Finally the capacitor is fully charged (VC = E) and current ceases (consequently VR = O).
  • This sequence is shown graphically below.
    529_Charging a capictor2.png  

The curves are called 'exponential' curves and it can be seen that the slopes dVc/dt and dl/dt are progressively decreasing as time increases.

 

Posted Date: 9/13/2012 4:42:34 AM | Location : United States







Related Discussions:- Charging a capacitor, Assignment Help, Ask Question on Charging a capacitor, Get Answer, Expert's Help, Charging a capacitor Discussions

Write discussion on Charging a capacitor
Your posts are moderated
Related Questions

Q. The radioactive isotope 84Pa214 undergoes a successive disintegration of two α decays and two β decays. Find the atomic number and the mass number of the resulting isotope.

Illustrates term refractive index in optical fibres? Refractive Index: Optical fibres consist of two layers which are core and cladding with various refractive indices. T

in water equivalent how the temperature or water and solid equal?

Coupled Harmonic Oscillators Two easy pendulums connected through a spring. The mass of one of the pendulums may be varied. Within mathematical rounding errors, the resolution

Advance of the Perihelion Together along with the deviation of light rays near the Sun the change of the orientation of Mercury's orbit century after century is a single of the

Clear definitions of, and rationale for defining variables as explanatory confounding (if required) effect modifying variables (if required) and rationale if the form

what is motion

How to identify a hard-boiled egg Secure a fresh egg and a hard-boiled egg. Give every of them a spinning motion in a soup dish or a plate. View that the hard-boiled one spins

Mercury:                Atomic number 80 Symbol Hg