Electric Current

An electric current is a flow of electric charge 

The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second.

Measurement of electric charge 

To measure electric charge we use

1-coulumb

2-electron

But we usually muse column

Single electrons have a charge too small for

practical use. The unit adopted for measuring

charges is the coulomb

electric current

is the flow of negative charges. Scientists and engineers once thought that current flowed in a direction opposite to electron

flow

Hole

When  an electron from one atom to the next created

the appearance of a positive charge, called a hole,

moving in the opposite direction