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| Pregunta | Respuesta |
| an electric current exists in a region of space when there's a net transfer of charge through a surface from one side to the other side of the region | I=q/t I(av)=∆Q/∆t |
| if a current through a surface varies either with magnitude or direction or bith it is unsteady or varying | a current is steady if the rate of flow of charge is constant.steady current is time independent |
| one ampere=one coulomb of charge passing through the cross section of a conductor in one second | circuit is a closed conducting path through which charge flows |
| current density at a point is the current per unit area around that point,area being taken perpendicular to the direction of the current | j=I/S j=∆i/∆scosa where a is the angle between current and area element |
| electric current through a metallic conductor is directly proportional to the potential difference across is provided temperature and other physical conditions are a constant | V=IR where R is the electrical resistance of the conductor. |
| electric resistance is the opposition offered by a conductor to the flow of electrons | R=(ro)I/A where (ro) is the resistivity or standard resistance |
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