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Difficulty: MediumElectrical Current and Electron Flow

Match each fundamental electrical current concept on the left with its correct technical definition or physical characteristic on the right.

  • Electron Flow TheoryPhysical model describing negatively charged particles drifting from the negative terminal toward the positive terminal.
  • Conventional Current FlowHistorical circuit analysis model that defines current as positive charges moving from the positive terminal toward the negative terminal.
  • One Ampere (1 A1\text{ A})Rate of electric charge movement equivalent to one coulomb passing through a conductor cross-section per second (1 C/s1\text{ C/s}).
  • Free Conduction ElectronsMobile valence particles in a metal lattice that drift under the influence of an applied electric field to produce current.

Answer

Electron Flow Theory matches the physical movement of negative charges from negative to positive; Conventional Current Flow matches the circuit analysis model from positive to negative; One Ampere matches one coulomb per second; Free Conduction Electrons match the mobile valence particles drifting through the metal lattice.
Each concept accurately pairs with its physical definition: Electron flow physically travels from negative to positive; conventional current travels from positive to negative; the ampere measures the rate of charge flow in coulombs per second; and free conduction electrons serve as the mobile charge carriers in metallic conductors.

Step-by-Step Solution

1
Identify the physical mechanism of charge carrier drift in solid conductors.
Free conduction electrons are the charge carriers in metals, and their physical drift toward the positive potential defines electron flow theory.
Electrons carry negative charge and are repelled by negative potential and attracted to positive potential.
2
Distinguish between conventional current and electron flow directional models.
Conventional current assumes positive-to-negative flow, while electron flow describes physical negative-to-positive movement.
Both conventions are standard in electronics and electrical engineering documentation.
3
Apply the fundamental SI definition of current magnitude.
Current (II) is the rate of charge (QQ) flow over time (tt), where 1 A=1 C/s1\text{ A} = 1\text{ C/s}.
The unit ampere measures rate of charge transfer, not static charge quantity or voltage.

Key Concept

Distinction between directional current models, charge carriers, and the SI rate definition of current.
Estimated Time:45s
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Topics

Electrical Current and Electron Flow

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