Eletric current
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8 Terms
Potential and potential difference
A positive charge flows from a point of higher potential to a point of lower potential. We have seen earlier that electricity flows due to the conduction of negatively charged electrons. Electrons flow from the point of lower potential to a point of higher potential.
Potential difference of a cell
The difference in potential between the positive and negative terminals of a cell is the potential difference of that cell. This potential difference is caused by chemical reactions occurring inside the cell. T
Free electrons
Every atom of a metallic conductor has one or more outermost electrons which are very weakly bound to the nucleus. These are called free electrons.
Current flowing through a wire
conducting wire is not connected to a cell, its free electrons move randomly in all directions in the space between the atoms. When we connect the ends of the wire to the two terminals of a cell, electric force acts on the electrons
Electric current
. Electric current is defined as the flow of electric charge, specifically the movement of free electrons, in a conductor due to a potential difference. It is measured in amperes (A).