The Ideal Diode 1.1 (a) In the circuit of Fig. P1.1 let v, 25 V, 4 mA. Find the

Question

The Ideal Diode 1.1 (a) In the circuit of Fig. P1.1 let v, 25 V, 4 mA. Find the voltage across and the current through the diode. (b) Repeat, but with v.-10V and is = 10 mA. (c) Repeat, but with vs-5 V and i 3 mA. (d) Repeat parts (a) through (c), but with a fourth resistance R4 = 1.8 k connected in parallel with the diode. List the cases in which this additional resistance make a difference, and those in which it doesn't RI Di FIGURE P1.1 a) b) c) d) VO, (open circuit) > 0 must be on, VD,-0 (ideal) , In-5 mA VDI (open circuit) must be off, lol-0, l'o, =-4 V VD1 (open circuit) = 0 must be off, lo! = 0, )/ = 0 V The additional resistance will make no difference in (a) and (c); in (b), the diode will be off with VDI-1.8 V.

Explanation / Answer

1 ) Diode is forward biased .hence voltage across the ideal diode is Zero

hence current across the diode is Id1=Vs/Reff -Is

Reff = 2.75 kilo ohms

Hence id1 = 25/2.75

Id1 = 5 milliamps

2) Diode is Forward biased and Voltage across the diode is zero

Id1 = -6.37 milli amps

3) Voltage across the diode is zero

id1= -1.19 milli amps

4)With extra 1.8 kilo ohms resistance added

id1 = -1.03 milli amps

voltage across the diode is zero

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