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pardesi
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when we say the current through a wire is uniform and is [tex]I[/tex] what do we mean
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olgranpappy said:The answers to the question of definition can be found in any textbook. I would suggest that you look in the appendix of Griffith's--maybe under "surface current" or "current, surface"?
griffith said:consider a "ribbon" of infitesmal width [tex]dl_{p}[/tex] running parallel to current flow and let the current through this be dI then we define surface current density K as [tex]K=\frac{dI}{dl_{p}}[/tex] where [tex]dl_{p}[/tex] is taken perpendicular to current flow
Surface current denslity is current per unit width of Griffith's ribbon, sopardesi said:well what i don't understand about this is why should we take a 'ribbon' isn't a small width enough to define .also if a take a width then the current flowing across it in general would depend on the ribbon length
pardesi said:well he says and i quote
well what i don't understand about this is why should we take a 'ribbon' isn't a small width enough to define .also if a take a width then the current flowing across it in general would depend on the ribbon length
In this context, "current" refers to the flow of electric charge through a wire. It is measured in amperes (A).
In the equation for current (I = Q/t), "I" represents the current in amperes, "Q" represents the electric charge in coulombs, and "t" represents the time in seconds.
A uniform current means that the flow of electric charge through a wire is constant and does not vary at any point along the wire. The current is the same at all points in the wire.
The uniformity of current in a wire is achieved by maintaining a constant potential difference (voltage) across the wire and ensuring that the wire has a uniform cross-sectional area. This ensures that the resistance of the wire remains constant and the current flowing through it is also constant.
A non-uniform current in a wire can lead to fluctuations in the flow of electric charge, which can affect the performance of electrical devices and may also result in overheating or damage to the wire. It is important to ensure a uniform current to maintain the stability and efficiency of an electrical circuit.