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TEEN Physics QUESTION #1036
Question 1
Full wave rectifier with \(V_{in}=220\sin(100\pi t)\) V. At \(t=15\ \text{ms}\), which diodes are forward/reverse biased?
  • \(D_1\) and \(D_2\) both forward biased
  • \(D_1\) and \(D_2\) both reverse biased
  • \(D_1\) forward biased, \(D_2\) reverse biased
  • \(D_1\) reverse biased, \(D_2\) forward biased✔️
Correct Answer Explanation
At \(t=15\ \text{ms}\): \(V_{in}=220\sin(100\pi\times0.015)=220\sin(1.5\pi)=220\times(-1)=-220\ \text{V}\). The voltage is negative (in the negative half cycle). In a full wave rectifier, during the negative half cycle, \(D_1\) is reverse biased and \(D_2\) is forward biased.