A high-voltage direct current power supply delivers an electromotive force (EMF) of 2.4\te… — Armed Services Vocational Aptitude Battery (ASVAB)

A high-voltage direct current power supply delivers an electromotive force (EMF) of $2.4\text{ kV}$ across a circuit load. Which of the following correctly expresses this potential difference in standard volts and describes its fundamental role in the circuit?

A
$2.4\text{ V}$ , which provides the electrical pressure to push current through the load
$2{}400\text{ V}$ , which provides the electrical pressure to push current through the loadAnswer
C
$2{}400\text{ A}$ , which measures the rate of charge flow through the load
D
$240\text{ V}$ , which measures the alternating frequency of the electrical source

Answer

2{}400\text{ V}

, which provides the electrical pressure to push current through the load

The correct response accurately applies the metric prefix multiplier for kilo- (

1\text{ kV} = 1{}000\text{ V}

) to compute

2.4 \times 1{}000 = 2{}400\text{ V}

, and correctly identifies electromotive force (EMF) as the electrical potential difference or pressure that drives electron flow through the circuit.

Step-by-Step Solution

Convert the electromotive force from kilovolts (

\text{kV}

) to standard volts (

\text{V}

)

2.4\text{ kV} \times 1{}000\text{ V/kV} = 2{}400\text{ V}

The metric prefix kilo- represents a factor of

10^3

(

1{}000

units).

Identify the physical role and unit of Electromotive Force (EMF)

EMF is the potential difference or electrical pressure that causes electrons to flow through a circuit, measured in volts (

\text{V}

)

Voltage/EMF is the driving force behind current, distinctly separate from current itself which is the rate of electron flow measured in amperes (

\text{A}

Key Concept

Electromotive force (EMF) is the potential difference (measured in volts) that provides the electrical pressure to drive charge through a closed circuit, where

1\text{ kV} = 1{}000\text{ V}

Estimated Time:1m 0s

Question

Answer

Step-by-Step Solution

Key Concept

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