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CAPACITORS (capacitance (is the ratio of the number of charges on each…
CAPACITORS
capacitance
is the ratio of the number of charges on each conductor to the potential difference between them
is the measure of the ability of the capacitor to store energy
Q=CV
parallel plate capacitors
capacitance of parallel plate capacitors
capacitance of concentric spheres
capacitors in series & parallel circuits
series
parallel
energy stored in charged capacitors
energy storage
electric field energy / energy density
charging & discharging capacitors
charging
1. by direct connection to the battery
W = vdq
2. using RC circuit
Q=εC
time dependant factor
τ=RC
discharging
capacitors with dielectrics
the function of dielectric
1. prevents breakdown of capacitors
2. enables the two conducting plates to be placed at a close distance without touching
3. increases the capacitance of a capacitor by a factor of k, the dielectric constant
capacitance of a parallel plate capacitor with dielectric
