Back to notes
Define direct current (DC).
Press to flip
Direct current (DC) is a unidirectional flow of current, such as from a battery.
Explain why electric current is considered a scalar quantity, even though it seems directional.
Electric current is considered a scalar quantity because its values add up through simple arithmetic addition, not vector addition.
How is alternating current (AC) graphically represented?
Alternating current (AC) is graphically represented as a sinusoidal wave, alternating between positive and negative values.
What is the frequency of a typical AC current from a power outlet?
The frequency of a typical AC current from a power outlet is generally 50 Hz.
What is the SI unit of electric current?
The SI unit of electric current is Ampere (A).
How do free electrons behave in a metallic conductor without a battery connection?
In the absence of a battery connection, free electrons are in random motion.
What historical misconception led to the concept of conventional current?
The historical misconception was that current was due to the flow of positive charges, rather than electrons.
Define steady current.
A steady current is a current where the rate of flow of charge remains constant over time.
How does current flow through metals?
Current flows through metals primarily due to the movement of free electrons.
How much charge passes through a conductor in 1 second to equal 1 Ampere?
1 Coulomb of charge passing through a conductor in 1 second equals 1 Ampere.
What is the formula for calculating electric current?
The formula is I = Q / t, where I is the current, Q is the charge, and t is the time.
Differentiate between electronic current and conventional current.
Electronic current is due to the flow of electrons from the negative terminal to the positive terminal, while conventional current is the hypothetical flow of positive charge from the positive terminal to the negative terminal.
Describe the motion of electrons in a metallic conductor when connected to a battery.
When connected to a battery, electrons move in a specific direction, creating a current.
Define alternating current (AC).
Alternating current (AC) is current that changes direction periodically, such as from a power outlet.
What is the definition of electric current?
Electric current is the flow of electric charge in a conductor.
In which direction do electrons flow in a circuit connected to a battery?
Electrons flow from the negative terminal to the positive terminal.
Explain the current flow through electrolytes.
Current through electrolytes flows due to the movement of positive and negative ions, and can include both ionic and free electron movement.
Previous
Next