Which of the following has the smallest current flowing through it?
A)a 1-m long copper wire of diameter 1 mm connected to a battery of 10 V
B)a 0.5-m long copper wire of diameter 0.5 mm connected to a 5-V battery
C)a 2-m long copper wire of diameter 2 mm connected to a 20-V battery
D)a 1-m long copper wire of diameter 0.5 mm connected to a 5-V battery
E)All of the choices have the same current.

Question

Quizplus · Accepted Answer

The current flowing through a wire depends on its length, cross-sectional area, and the voltage applied across it. Smaller diameter wires offer more resistance to the flow of current, so they have less current flowing through them. Therefore, the wire with the smallest diameter, which is option D, will have the smallest current flowing through it.

Which of the Following Has the Smallest Current Flowing Through