answer in full sentences Imagine a wire with a non-uniform cross section. It tap
ID: 3895837 • Letter: A
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answer in full sentences
Imagine a wire with a non-uniform cross section. It tapers down from a large radius to a small radius. If an electric potential is applied across this wire would the current density remain constant along the length of the wire, would the total current remain constant along the length of the wire or would neither remain constant? Explain your answer. If you want to maximize the energy dissipated by a resistor, should you make the resistance really high, or really low? Why?Explanation / Answer
2) The current density is given by: J= ne(Vd)
where n is the number of electrons per unit volume (electrons density), e is the charge of single electron, which is 1.6*10-19 C and the electrons velocity called drift velocity (Vd) remains constant at constant voltage.
Therefore the current density remains same along the length.
On the other hand, the current along the length decreases as the area of cross section decrease.
3)Since the voltage in this case remains constant,
P = V^2/R
R decreases, Power increases.
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