PHYS 1112 Module 5.1

Electrical Current

Build your own circuit with this Circuit Construction Kit Simulation

Practice!

Practice 5.1.1
Consider positive and negative charges moving horizontally through the four regions shown in the figure.

Rank the current in these four regions from highest to lowest.
A. (b) > (c) > (d) > (a)
B. (c) > (b) > (a) > (d)
C. (d) > (b) = (c) > (a)
D. (a) > (b) = (c) > (d)
Check your answer: D. (a) > (b) = (c) > (d)
Practice 5.1.2
Consider the following four situations:

i)  An ion (charge +Q) moves to the right.
ii) A neutral hydrogen atom (proton, +e, and electron, -e) moves right.
iii) A beam of electrons shoots to the right
iv) In an ionic solution, massive positive ions flow right, light negative electrons flow with equal speed to the left.

In which of these is the net current ZERO?
Check your answer: B. ii only
Practice 5.1.3
Consider the following four situations:

i)  An ion (charge +Q) moves to the right.
ii) A neutral hydrogen atom (proton, +e, and electron, -e) moves right.
iii) A beam of electrons shoots to the right
iv) In an ionic solution, massive positive ions flow right, light negative electrons flow with equal speed to the left.

In which is the net current to the RIGHT?
Check your answer: D. i and iv only