A working circuit contains a 3V power supply, a 5000uF Capacitor, and a 200ohm resistor.(adsbygoogle = window.adsbygoogle || []).push({});

a) What is the time constant for the circuit?

b) What is the charge in coloumbs on the capacitor at a potential difference of 3V?

c) How much energy is stored on the Capacitor at a potential difference of 3V?

d) Calculate the initial value of the current when the fully charged capacitor starts to discharge through the resistor.

Attempt:

a) T=RC

= 200 X (5000X10^{-3})

=1000 seconds

b) Q=CV

Q = 5000X10^{-3}X3

= 15C

c) E=1/2CV^{2}

E=1/2 X 5000X10^{-3}X 3^{2}

E = 22.5J

d) Q=Q_{0}e^{-t/RC}

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Capacitance Question

**Physics Forums | Science Articles, Homework Help, Discussion**