Current, Resistance and Electromotive Force PDF

Current, Resistance and Electromotive Force  𝑪𝑼𝑹𝑹𝑬𝑵𝑻 A 𝒄𝒖𝒓𝒓𝒆𝒏𝒕 is any motion of charge from one region to another.  By convention, one visualizes electrical current as positive charges moving in the direction of the electric field (fig. a), altho...

Current, Resistance and Electromotive Force  𝑪𝑼𝑹𝑹𝑬𝑵𝑻 A 𝒄𝒖𝒓𝒓𝒆𝒏𝒕 is any motion of charge from one region to another.  By convention, one visualizes electrical current as positive charges moving in the direction of the electric field (fig. a), although it is really the electrons which are moving in opposition. In the absence of an electric field, electrons move randomly in a conductor  In the absence of an electric field, electrons move randomly in a conductor Connecting the conductor to a battery creates an electric field in the conductor, which accelerates the electrons. However, the electrons “𝒄𝒐𝒍𝒍𝒊𝒅𝒆” with the atoms in the conductor. The combined effect of the electric field and the collision is a steady state drift of the electrons - 𝒅𝒓𝒊𝒇𝒕 𝒗𝒆𝒍𝒐𝒄𝒊𝒕𝒚.  What happens when a constant, steady electric field is established inside a conductor? A charged particle (such as a free electron) inside the conducting material is then subjected to a steady force. A steady acceleration in the direction of force will result from the charged particle moving in vacuum, in which after some time the charged particle would be moving in that direction at high speed. Sample Problem 1 Sample Problem 2