Find the diode states for the circuits shown in Figure 1017

Find the diode states for the circuits shown in Figure 10.17. Asumme ideal diodes. Please show your work and solve for a-c.

Solution

A diode is a two terminal device. The two terminals of diode are anode and cathode. The diode is forward biased when the positive is connected to anode and negative to cathode. When the diode is forward biased then it conducts and allows current to flow through it without any resistance that is diode is on . When the diode is reverse biased then it does not conducts and does not allows current to flow through it that is diode is off. Thus an ideal diode acts as a switch either open or closed depending upon the polarity of voltage applied across it. The ideal diode has a zero resistance under forward bias and infinite resistance under reverse bias.

From the figure (a) it is clear that the anode is connected to the positive terminal which means that the diode is forward biased. So therefore diode D1 is on that condition.

From the figure (b) it is clear that the anode is connected to the negative terminal which means that the diode is reverse biased. So therefore diode D2 is off in that condition.

Similarly from (c) it is clear that the diode D3 anode is connected to the negative terminal which means that the diode D3 is reverse biased. So therefore diode D3 is off in that condition. And the anode of diode D4 is connected to the positive terminal which means that the diode D4 is forward biased. So therefore diode D4 is on that condition.