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Zorluk: OrtaVoltage and Electromotive Force (EMF)

A high-voltage direct current power supply delivers an electromotive force (EMF) of 2.4 kV2.4\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?

  1. A
    2.4 V2.4\text{ V}, which provides the electrical pressure to push current through the load
  2. 2400 V2{}400\text{ V}, which provides the electrical pressure to push current through the loadCevap
  3. C
    2400 A2{}400\text{ A}, which measures the rate of charge flow through the load
  4. D
    240 V240\text{ V}, which measures the alternating frequency of the electrical source

Cevap

2400 V2{}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 kV=1000 V1\text{ kV} = 1{}000\text{ V}) to compute 2.4×1000=2400 V2.4 \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.

Adım Adım Çözüm

1
Convert the electromotive force from kilovolts (kV\text{kV}) to standard volts (V\text{V})
2.4 kV×1000 V/kV=2400 V2.4\text{ kV} \times 1{}000\text{ V/kV} = 2{}400\text{ V}
The metric prefix kilo- represents a factor of 10310^3 (10001{}000 units).
2
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 (V\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 (A\text{A}).

Anahtar Kavram

Electromotive force (EMF) is the potential difference (measured in volts) that provides the electrical pressure to drive charge through a closed circuit, where 1 kV=1000 V1\text{ kV} = 1{}000\text{ V}.
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Voltage and Electromotive Force (EMF)

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