Home   |  Schematics |  Products |  Tutorials  |  Datasheets  |  Robotics   |   Download    |   Link Exchange


Direct Current
Alternating Current
Digital Electronics
PC Architecture
Electronics Dictionary
Resources

Experiment
Calculator/Converters
Radio
Newsletter
Associations and Societies
Component Manufacturers


Electronics Symentics


Electrical Circuits and Formulae

Capacitance

When a voltage is applied to a circuit containing capacitance, current flows to accumulate charge in the capacitance:

Q = idt = CV

Alternatively, by differentiation with respect to time:

dq/dt = i = C dv/dt

Note that the rate of change of voltage has a polarity which opposes the flow of current.

The capacitance C of a circuit is equal to the charge divided by the voltage:

C = Q / V = idt / V

Alternatively, the capacitance C of a circuit is equal to the charging current divided by the rate of change of voltage:

C = i / dv/dt = dq/dt / dv/dt = dq/dv