Electric Current — Chapter Summary

Electric current is the amount

Electric current is the amount of charge crossing any cross section of a conductor in one second. The formula is I = Q/t. In an open circuit, random e

Electrons in a metal do not

Electrons in a metal do not move in a straight fast stream. They move with a very small average speed called drift speed or drift velocity. For a copp

For negative charges

For negative charges, current direction is opposite to electron flow. Conventional current is taken as the direction of positive charge flow. In metal

Potential difference is the work done

Potential difference is the work done by the electric force on unit positive charge to move it from one point to another. The relation is V = W/q = F_

emf is the work done by

emf is the work done by the chemical force to move unit positive charge from the negative terminal to the positive terminal of a battery. It is writte