When a voltmeter is connected across a forward-biased diode it will read a voltage approximately equal to
Right Answer is:
Diode barrier potential
When a voltmeter is connected across a forward-biased diode it will read a voltage approximately equal to diode barrier potential.
Once PN junction is formed and depletion layer created, further movement of charge carriers across the junction stops i.e. depletion layer acts as a barrier to the movement of charge carriers across the junction. There exists a potential difference across the depletion layer and is called barrier potential.
Forward bias breaks down the barrier or depletion region in a diode, and current flows through the diode. Bias is just another name for a DC voltage. Hence in the forward bias condition, the diode read voltage is approximately equal to barrier potential voltage.