11 Questions
Which of the following is a property of current electricity?
It is the flow of electric charge through a conductor
What is the SI unit of electric current?
Ampere
In which direction does conventional current flow?
From positive to negative
What is the formula for calculating current density?
J = I/A
How does an increase in cross-sectional area affect the current density?
An increase in cross-sectional area decreases the current density.
Explain how current density is different from current?
Current density is the amount of current flowing through a unit area, while current is the flow of electric charge per unit time.
What is the definition of current density?
The amount of charge per unit time that flows through a unit area of a chosen cross section.
How is the current density vector defined?
As a vector whose magnitude is the electric current per cross-sectional area at a given point in space, with its direction being that of the motion of the positive charges at that point.
What are the SI base units for measuring electric current density?
Amperes per square metre.
How is the electric current density at a given point M calculated?
It is given by the limit of the electric current flowing through a small surface A centered at M and orthogonal to the motion of the charges at M.
What is the relationship between charge density, velocity of charges, and electric current density?
The charge contained in the volume formed by the velocity and an infinitesimal surface will flow through that surface, and is given by the equation dq = ρ v dt dA.
Test your knowledge of current electricity with this quiz. Explore properties, units, and direction of conventional current flow.
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