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Difficulty: EasyVoltage and Electromotive Force (EMF)

An automotive technician measures an electromotive force (EMF) of 12.6 V12.6\text{ V} across the terminals of a vehicle battery with no load connected. What does this electromotive force represent?

  1. A
    The rate at which electric charge flows through a closed circuit
  2. The electrical potential difference available to move electrons through a circuitAnswer
  3. C
    The continuous reversal of electrical charge direction between the terminals
  4. D
    The flow of positive charges traveling directly from the negative terminal to the positive terminal

Answer

The electrical potential difference available to move electrons through a circuit
Electromotive force (EMF), commonly referred to as voltage, is the electrical potential difference established between two points. It acts as the electrical driving pressure that causes free electrons to move through a conductor when a complete circuit is formed.

Step-by-Step Solution

1
Identify the electrical quantity being measured and its unit
The measurement is 12.6 V12.6\text{ V}, which represents electromotive force (EMF) or voltage.
Volts (V\text{V}) are the standard unit of measure for electrical potential difference and electromotive force.
2
Relate electromotive force to fundamental circuit principles
EMF is the electrical pressure or work per unit charge created by a source to move electrons through an external pathway.
Voltage creates the electric field necessary to establish and maintain current in a closed circuit.

Key Concept

Electromotive Force and Potential Difference
Estimated Time:45s
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Topics

Voltage and Electromotive Force (EMF)

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