- Electricity is indispensable to us .
- From the humble torch to the powerful computer, thousands of things we use everyday need electricity to work.
- The source of all electricity is charge.
- As charge is the basis of all electrical phenomena, we often need to know the amount of charge on a body.
- is measured in coulombs.
- the columns is the SI unit of charge and its symbol is C.
- matter are genrally made of protons,electrons and neutrons.
- Each prontons carries a charge of 1.6 ×10^-19 .
- Each electrons carries a charge of 1.6 ×10^-19.
- Neutrons not carry any net charge.
Electric current
- charges particle is that can flow that is they can move in a particular direction.This Flow of charge particles is called an Electric current.
- Denoted by i
- SI unit of elctric current is amphere.
Potential Difference and the flow of charge
The potentail difference between two points A and B is the work done per unit charge in taking charge from B to A.
V= VA-VB=W/q
