Are you wondering why you sometimes get an electric shock by just touching a door knob or some electrical switch? Or why do you feel the current when you brush up with someone else? This happens when static electricity gets generated between two objects.
When the materials come in contact with each other, charges get transferred between them. Because of this, one object carries an excess positive charge and the other one has an equal amount of negative charge. Once they get separated, one becomes positively charged and the other negatively charged.
The voltage in this static charge can reach as high as 15,000 volts.
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Dry conditions, caused by indoor heating or cold weather, also play an important part in creating static shocks.
One can start walking barefoot indoors to avoid getting a shock. Also, humid weather can keep people away from such shocks.