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Page 1

Preview of page 1 Capacitors (A2-Physics)

A capacitor is an electronic component that can store electrical charge and then release it.
It is made of two conducting plates separated by an insulator.
The charge that is stored by the capacitor is due to the potential difference across. We can write this…

Page 2

Preview of page 2 Capacitors (A2-Physics)

Charging and Discharging
In the diagram to the right a capacitor can be charged by the battery if
the switch is moved to position A. It can then be discharged through a
resistor by moving the switch to position B.

Charging a Capacitor
When the switch is…

Page 3

Preview of page 3 Capacitors (A2-Physics)

Exponential Decay
Finding from Graphs
The time constant of a discharging capacitor can be found from a graph of either charge, current or potential
difference against time. After one time constant the value will have dropped to 0.37 of the initial value.

In this case the time…




really helpful 10/10 thank u :)



You're most welcome

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