16 Questions
In electric circuits, what are the charge carriers often?
Electrons
What do electric currents create in ordinary conductors?
Magnetic fields
What is the SI unit for electric current?
Ampere
What device is used to measure electric current?
Ammeter
In which type of conductor can charge carriers be electrons or holes?
Semiconductors
What are the moving particles called in an electric current?
Charge carriers
In a conductive material, what are the moving charged particles that constitute the electric current called?
Charge carriers
In metals, which type of particles are the charge carriers responsible for electric current?
Electrons
Who used the symbol I to represent current in formulating Ampère's force law?
André-Marie Ampère
What are the charge carriers in semiconductors?
Positive or negative
Why is a convention needed for the direction of current that is independent of the type of charge carriers?
Because current can be the flow of either positive or negative charges, or both
What does a flow of positive charges give in an electrical circuit?
The same electric current as an equal flow of negative charges in the opposite direction
What is meant by the reference direction of the current I?
The direction representing positive current specified by an arrow on the circuit schematic diagram
When analyzing electrical circuits, why are the reference directions of currents often assigned arbitrarily?
The actual direction of current through a specific circuit element is usually unknown until the analysis is completed
'Ohm's law' states what relationship?
$I = V/R$
What does Ohm's law state about the relationship between current, voltage, and resistance?
$I = V/R$
Test your knowledge of electric current with this quiz covering the definition, properties, and behavior of electric currents in conductors, semiconductors, and electrolytes.
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