When the voltage across the forward biased diode is measured, the meter displays

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BlackTom AI · Accepted Answer

Consider the context: a voltmeter measuring the voltage across a forward-biased diode.
Option a: 'the total voltage of the circuit.' This is incorrect because the meter is connected across only the diode, not across every element in the circuit, so it cannot read the entire circuit voltage.
Option b: '1 A.' This is a current value, not a voltage. A voltmeter measures voltage, so reporting current here would be inappropriate and misleading.
Option c: '0 V.' In forward conduction, a diode typically drops a small, finite voltage (often around 0.6–0.7 V for a silicon diode). Therefore, reading 0 V would imply no drop across the diode, which contradicts forward conduction and is unlikely in a conducting state.
Option d: 'threshold voltage of the diode.' This phrasing captures the idea of the forward voltage drop that appears when a diode conducts in forward bias. While the exact value can vary (e.g., ~0.7 V for silicon, sometimes a bit lower or higher depending on diode type and current), the meter indeed shows the forward voltage drop across the diode, i.e., the threshold-like drop required to sustain conduction.
In summary, the measured quantity aligns with the forward voltage across the diode, not the total circuit voltage, not a current value, and not zero volts; hence the described reading corresponds to the forward voltage drop characteristic of a conducting diode.

BL50A0021 Basic Electronics 1 - Blended teaching, in English 6.1.2025-23.2.2025 Exam 1

When the voltage across the forward biased diode is measured, the meter displays

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