Question

Explain the working of p-n junction diode in forward and reverse biased

Answer 1

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• There are two ways in which we can bias a pn junction diode.

•The basic difference between a forward bias and reverse bias is in the direction of applying external voltage.

•The direction of external voltage applied in reverse bias is opposite to that of external voltage applied in forward bias.

Answer 2

In forward biased p-n junction acts like a wire having very low resistance

In reversed biased p-n junction acts like an open circuit having very high resistance

Explanation:

P-n junction diode is a device which is used for rectification. We can use it in two forms forward biased and reversed biased

Forward biased :-

• When p type semiconductor is connected to the positive terminal of battery and n type semiconductor is connected to negative terminal of battery is known as forward biased connection
• In forward bias diode have very small resistance so acts like a short circuit
• Holes from positive terminal make repulsion to holes in p type semiconductor similarly negative terminal repel majority charges of n type semiconductors due to this width of depletion layer reduces hence charges can easily jump from one side to another

Reversed biased :-

• When p type semiconductor is connected to the negative terminal of battery and n type semiconductor is connected to positive terminal of battery is known as reverse biased connection

• In reverse bias diode have very high resistance so acts like an open circuit

• Holes from positive terminal make attraction to majority charges that is electrons in n type semiconductor similarly negative terminal attract majority charges of p type semiconductors due to this width of depletion layer increases hence charges cannot easily jump from one side to another and have more resistance

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