Question

Electrons in an electric circuit pass through a resistor. The
wire on either side of the resistor has the same diameter. (a) How
does the drift speed of the electrons before entering the resistor
compare to the speed after leaving the resistor? Explain your reasoning.
(b) How does the potential energy for an electron before
entering the resistor compare to the potential energy after leaving
the resistor? Explain your reasoning.

Answer 1

well, if u know the equation I = NEVA where N= no. density of electrons, E= charge on a single electron, V=drift speed ,and A=area of cross-section.
since the diameters are same , the area of cross-section must be same and therefore the drift speed also will be the same
b) as u know current flows from higher to lower potential.The electrons will flow from lower potential to higher potential. Higher potential implies higher potential energy and therefore potential energy must increase.