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9702 · 21.2

Rectification and smoothing

Ever wondered how your phone charger turns wall current into a steady flow for your battery? It's all about **rectification** and **smoothing**! In this lesson, we'll explore how alternating current (**AC**) is converted into direct current (**DC**) and then made wonderfully stable, ready for all your electronic gadgets. Get ready to understand the unsung heroes of power conversion. This pilot aligns with **Senpai Corner** A Level notes (2025–2027) for topic **21.2**.

Need to know

What you need to know

  • Uses a single diode to allow current flow in one direction.
  • Blocks one half of the AC input cycle.
  • Produces a pulsating DC output with a frequency equal to the AC input frequency.
  • Inefficient as it wastes half of the input power.

Explanation

Rectification and smoothing

  1. Uses a single diode to allow current flow in one direction.
  2. Blocks one half of the AC input cycle.
  3. Produces a pulsating DC output with a frequency equal to the AC input frequency.
  4. Inefficient as it wastes half of the input power.
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