Question

When the diode is forward biased, it is equal to?

Answer 1

We are asked here to define the forward biasing of a diode and what it is equivalent to when it is forward biased. Forward biasing is joining the positive terminal of the voltage source to the p section of a P-N junction diode.

Complete answer:
Semiconductors with accepting or donating abilities are doped which is introducing impurities into a semiconductor to increase their conductivity. Both forward bias and reverse bias are the special cases of the P-N junction diode. The joining of the terminals of voltage source with P-type or N-type makes different biases like forward and reverse biases.

Forward biasing is when the positive of the voltage terminal joined with the P section is called forward bias. In the forward bias condition the positive terminal of the voltage source with the P-type so that the positive holes repulse towards the depletion layer and the negatively charged electrons repulse towards the depletion layer.

The bias potential pressures the holes to recombine with the ions near the depletion layer. Therefore the width of the depletion layer reduces. Since the potential barrier reduces, the electrons attract towards the positive terminal and suddenly the current increases exponentially.

When the diode is forward biased, the diode conducts current like a good conductor with less resistance similar to on switch in networks.

Note: Forward biasing means putting a voltage across a diode that allows current to flow easily while reverse biasing means putting a voltage across a diode in the opposite direction. The voltage with reverse biasing does not cause appreciable flow of current and it is the opposite to that of forwarding bias.