Current and Drift Velocity

The video tutorial explains electric current, its symbol, and units. It differentiates between instantaneous and average current, and discusses the concept of conventional current versus actual electron flow. The tutorial models current flow using positive charges and introduces equations for average current. It covers charge carrier density, drift velocity, and derives the current equation. The tutorial concludes with a summary of the concepts discussed.

What is the symbol used to represent electric current?

• I

• V

• C

• A

In conventional current flow, which direction do positive charges move?

• In a circular path

• Opposite to the direction of electrons

• Same as the direction of electrons

• Perpendicular to the wire

What does charge carrier density represent?

• The total charge in a wire

• The number of charge carriers per unit volume

• The speed of charge carriers

• The resistance of a wire

What is drift velocity?

• The maximum speed of electrons

• The velocity of sound in a wire

• The speed of light in a vacuum

• The average velocity of charge carriers in a wire

How is the current in a wire calculated using drift velocity?

• By subtracting the drift velocity from the speed of light

• By multiplying charge carrier density, cross-sectional area, drift velocity, and charge per carrier

• By adding the resistance and voltage

• By dividing the total charge by time