#### Charging a Capacitor

As a capacitor is charged by a battery, it becomes progressively more difficult
for electrons from the battery to reach the negative plate of the capacitor due to the repulsion
by the electrons that got there first.

Hence the

**current** in the circuit progressively decreases.

As a result of this, the **voltage** across the capacitors although increasing, increases at a decreasing rate.

Charging of the capacitor will stop when the voltage of the capacitor equals to the voltage of the battery that is charging it.

#### Discharging a Capacitor

When a capacitor is discharged (connected in a circuit to do something, like power a camera flash), the
current flows out rapidly at first.

A similar pattern is observed for the voltage across the plates. There is a rapid drop in voltage.

**IMPORTANT**
- The CHARGING and DISCHARGING CURRENT graphs have the SAME shape.
- The VOLTAGE DISCHARGING has the same shape as the CURRENT graphs.
- It is only the VOLTAGE CHARGING graph that looks different.

#### Other Graphs

This equation is the capacitor equation.

Notice that **C** is proportional to **A**. (all other factors constant)

Also **C** is inversely proportional to **d** (all other factors constant)

If the axis is inverted, then the shape is as follows: