Electricity 4 Flashcards
What does a capacitor store
Charge and energy
What happens to the current when the capacitor is fully charged
The current drops to 0
Does current flow through the capacitor
No
The current in the circuit is the largest when …
When the capacitor fist starts to charge up
What happens to the voltage as the capacitor discharges
The voltage falls to 0
What is the capacitance defined as
The charge stored per volt
What is the unit of measurement for capacitance
Farad (F)
What is one farad equal to
1 coulomb per volt
How do you calculate the capacitance
C = Q / V
Explain how work is done when charging the capacitor
As more electrons build on the -ve plate they repel other electrons. The battery must do work to push thee electrons on and charge the capacitor
How do you calculate the energy stored
E = 1/2 QV or 1/2 CV2 or 1/2 Q2/C
