Capacitors Flashcards
0
Q
What is the unit of capacitance?
A
Charge per unit voltage, one coulomb per volt; 1 Farad
1 Farad = 1C.
1
Q
What is a capacitor?
A
A device that stores charge. Effectiveness depends on how much charge it will store depending on the voltage across it.
Stores charge & therefore energy.
2
Q
What is the equation for capacitance?
A
Q=CV, usually in milli/microfarads.
3
Q
How do you calculate energy stored in a capacitor?
A
E=VQ.
or:
E=1/2QV or E=1/2CV^2.
4
Q
How do you add capacitors in parallel?
A
C1+C2+C3=CT
5
Q
How do you add capacitors in series?
A
1/C1+1/C2=1/C3=1/CT
6
Q
What is the equation for rate of discharge of a variable in capacitors?
A
x=x0e^-t/RC
