E3: Electric current 29 LECTURE! 3-2 ELECTRIC CURRENT AND CHARGE CARRIERS Movement of charge Any movement of charge constitutes an electric current. The charge carriers could be electrons in a vacuum, electrons in a metal, 'holes' in a semiconductor or ions in a solution. The charge may move in free space, through a conductor or on a conveyor belt.
An electric current is the rate of flow of electric charge past a point: 2: 622 or region.  : 614 An electric current is said to exist when there is a net flow of electric charge through a region.  : 832 In electric circuits this charge is often carried by electrons moving through a wire .
Physics Module Form 5 Chapter 2- Electricity GCKL 2011 2-3 Electric Current 1. Electric current is defined as the rate of flow of electric charge 2. In symbols, it is given as: where I = electric current Q = charge t = time (i) The SI unit of charge is (Ampere / Coulomb / Volt) (ii) The SI unit of time is (minute / second / hour) Jun 19, 2008 · Electric current is the flow (movement) of electric charge. The SI unit of electric current is the ampere, and electric current is measured using an ammeter. For the definition of the ampere, see the Ampere article.A solid conductive metal contains a large population of mobile, or free, electrons. This means that it provides a ﬁxed amount of energy to each coulomb of electric charge that moves around the circuit, and that two coulombs of charge receive twice as much energy as one coulomb of charge. The amount of energy provided, percoulombofchargemoved,iscalledthebattery’svoltage: batteryvoltage= energyprovided amountofcharge. (5.1)
Electrical current in a metal is a flow of electrons When current flows, electrical work is done and energy transferred. The amount of charge passing a point in the circuit can be calculated using... Charge, Current & Time. ... A current of 12 A flows for 20 minutes into an electric cooker. How much charge has the cooker used? Question 3.