Electrostatics

Charge [Measured in Coulombs] are of POSITIVE and NEGATIVE; Opposite attract, Like repel

Charging - Involves adding or removing electrons from a body

Experiment -

1. Charge polythene rod using silk tie to charge it
2. Place that rod in a cradle and suspend it using thread
3. Charge a perspex rod the same way
4. Bring the perspex rod close to the polythene rod and watch as they attract

POLYTHENE AND PLASTICS → Gains electrons [Becomes negative]

PERSPEX AND SILK ETC. → Loses electrons [Becomes positive]

Friction -

Friction between 2 objects causes electron exchange from X to Y, resulting in one positive [Losing electrons] and one negative [Gaining electrons] [Direct contact]

Conductors and Insulators -

Conductors allow charge carries to freely move [delocalized electrons are free to move]

Insulators do not allow charge carries to move [no delocalized electrons hence none to carry the charge] - Hence no current since no electrons and flowing