Name one d.c. source and one a.c. source.

Answer

**Step-by-Step Solution:**

1. **Understanding DC (Direct Current):**
- DC stands for Direct Current. It refers to a type of electrical current that flows in one direction only. The magnitude of DC remains constant over time.

2. **Identifying a DC Source:**
- A common source of DC in everyday life is a **cell** or **battery**. These devices provide a steady voltage and current, making them ideal for powering devices that require a constant flow of electricity.

3. **Understanding AC (Alternating Current):**
- AC stands for Alternating Current. This type of current periodically reverses direction, meaning that the flow of electricity changes its sign over time. The magnitude of AC also varies with time.

4. **Identifying an AC Source:**
- A typical source of AC that we use in our daily lives is the **electricity supplied by power outlets** in homes and businesses. This electricity alternates in direction and is usually at a frequency of 50 or 60 Hz, depending on the region.

5. **Final Answer:**
- One DC source: **Cell or Battery**
- One AC source: **Electricity from Power Outlets**

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