Current Electricity

Electric current is the rate

Electric current is the rate of flow of charge, i=Q/t. It is measured in ampere by an ammeter connected in series. One ampere means one coulomb of cha

Electric potential at a point

Electric potential at a point is the work done in bringing unit positive charge from infinity to that point. Potential difference is the work done in

Resistance is the obstruction offered

Resistance is the obstruction offered to the flow of current due to collisions of free electrons with positive ions of the conductor. It depends on th

Ohm's law states that the current

Ohm's law states that the current through a conductor is directly proportional to the potential difference across it, provided physical conditions rem

Ohmic conductors obey Ohm's law

Ohmic conductors obey Ohm's law and give a straight-line V-i graph. All metals and metallic alloys are ohmic resistances. Non-ohmic conductors do not