Ask a Question

Find current I if V = 5V and -5V when VB = 2V, R1 = 2KΩ, R2 = 4KΩ and the diode is ideal.

← Prev Question Next Question →
+1 vote
561 views
in Analog Circuits by (87.8k points)
Find current I if V = 5V and -5V when VB = 2V, R1 = 2KΩ, R2 = 4KΩ and the diode is ideal.

(a) 0A and 1.3mA

(b) 1.231mA and 0.33mA

(c) 3.25mA and 0A

(d) 1.58mA and 0A

This question was addressed to me in an interview for job.

Enquiry is from Ideal Diode Model topic in portion Diode Circuit of Analog Circuits

1 Answer

+1 vote
by (1.6m points)
selected by
 
Best answer
The correct answer is (c) 3.25mA and 0A

Best explanation: In ideal diode model the diode is considered as a perfect conductor in forward bias and perfect insulator in reverse bias. That is voltage drop at forward bias is zero and current through the diode at reverse bias is zero.

When V=5V, the diode is forward biased and can be considered as a short circuit.

Current through resistor R1 = V/2k = 2.5mA.

Current through resistor R2 = (V – VB)/4k = 0.75mA.

So total current is  3.25mA.

At V = -5V, diode is reverse bias So the current is zero.

Related questions

Welcome to TalkJarvis QnA, a question-answer community website for the people by the people. On TalkJarvis QnA you can ask your doubts, curiosity, questions and whatever going in your mind either related to studies or others. Experts and people from different fields will answer.

Most popular tags

biology – class 12 biology – class 11 construction & building materials chemistry – class 12 electronic devices & circuits network theory data structures & algorithms ii cell biology ic engine insurance finance money computational fluid dynamics engineering physics i discrete mathematics chemistry – class 11 aerodynamics casting-forming-welding i engineering mathematics operating system casting-forming-welding ii engineering drawing mysql engineering geology digital circuits wireless mobile energy management electrical measurements digital communications cyber security analytical instrumentation embedded systems electric drives cytogenetics advanced machining computer fundamentals life sciences basic civil engineering iot design of electrical machines physics – class 12 applied chemistry dairy engineering basic chemical engineering cloud computing microprocessor bioinformatics aircraft design aircraft maintenance software engineering drug biotechnology digital signal processing biochemistry data structures & algorithms i automotive engine design avionics engineering material & metallurgy energy engineering cognitive radio unix electrical machines biomedical instrumentation object oriented programming electromagnetic theory power electronics analog communications bioprocess engineering civil engineering drawing engineering metrology physics – class 11 mathematics – class 12 engineering chemistry i basic electrical engineering unit processes mongodb signals and systems cryptograph & network security hadoop mathematics – class 11 engineering physics ii html control systems engineering mechanics antennas analog circuits computer network java sql server javascript concrete technology chemical process calculation artificial intelligence design of steel structures c++ database management computer architecture engineering chemistry ii corrosion engineering chemical technology dc machines
Powered by TalkJarvis
...