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Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

Determine the currents passing through the resistances in the circuits depicted in the figure.

Options

  1. A(a) 1 A , (b) 0 , (c) 1 A , (d) 1 A
  2. B(a) 0 , (b) 1 A , (c) 1 A , (d) 1 A
  3. C(a) 1 A , (b) 0 , (c) 0 , (d) 1 A
  4. D(a) 1 A , (b) 1 A , (c) 1 A , (d) 0

Correct answer

A. (a) 1 A , (b) 0 , (c) 1 A , (d) 1 A

Step-by-step solution

Assuming the diodes to be ideal, they act as short circuits when forward-biased and open circuits when reverse-biased. In circuit (a), both diodes are forward-biased as their p-sides are connected towards the positive terminal of the battery. They act as short circuits. The current is I_a = V R = 2 2 = 1 A . In circuit (b), the first diode is forward-biased but the second diode is reverse-biased. The reverse-biased diode acts as an open circuit, breaking the series circuit. Thus, the current is I_b = 0 . In circuit

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