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Difficulty: EasyElectrical Current and Electron Flow

A technician connects a diagnostic meter into a vehicle wire harness to measure the quantity of electric charge passing through a conductor per second. Which electrical property is the technician measuring?

  1. A
    Electromotive force
  2. Electric currentAnswer
  3. C
    Electrical resistance
  4. D
    Alternating frequency

Answer

Electric current represents the measured rate of electrical charge passing through a conductor per second.
Electric current is defined as the rate at which electrical charge passes a given cross-section of a conductor, mathematically represented by I=QtI = \frac{Q}{t}, where one ampere equals one coulomb of charge per second.

Step-by-Step Solution

1
Analyze the physical measurement described in the question.
The measurement monitors charge (QQ) moving past a point over elapsed time (tt).
Identifying the relationship between electrical charge and time determines the correct physical quantity.
2
Match the formula I=QtI = \frac{Q}{t} to its standard electrical property.
The rate of charge flow per second defines electric current, measured in amperes (1 A=1 C/s1\text{ A} = 1\text{ C/s}).
Electric current is the formal definition of moving electric charge carriers through a conductor.

Key Concept

Electric current is the rate of flow of electric charge over time, expressed as I=QtI = \frac{Q}{t} and measured in amperes.
Estimated Time:35s
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Topics

Electrical Current and Electron Flow

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