The commonly not used sources which give rise to direct current are

Options

A. simple voltaic cell
B. bulb
C. lead storage batteries
D. dry cell

Answer

**Step-by-Step Text Solution:**

1. **Understanding Direct Current (DC):**
- Direct current (DC) is a type of electrical current that flows consistently in one direction. It is commonly used in various applications, such as in batteries and electronic devices.

2. **Identifying Common Sources of DC:**
- Some of the most common sources of direct current include:
- **Batteries:** Both rechargeable (like storage batteries) and non-rechargeable (like dry cells) provide DC.
- **Solar Cells:** These convert sunlight directly into DC electricity.
- **DC Generators:** These are machines that convert mechanical energy into DC electricity.

3. **Identifying Less Common Sources of DC:**
- The question specifically asks for sources that are "commonly not used" for providing direct current. This implies looking for sources that are less prevalent or not typically associated with DC.
- Examples of such sources may include:
- **Fuel Cells:** While they produce DC, they are not as commonly used in everyday applications compared to batteries.
- **Thermophotovoltaic Cells:** These convert heat into electricity and can produce DC but are not widely used.
- **Piezoelectric Devices:** These generate electricity from mechanical stress and can produce DC but are not commonly used for power supply.

4. **Conclusion:**
- In summary, while there are many sources of direct current, the commonly not used sources that give rise to direct current include fuel cells, thermophotovoltaic cells, and piezoelectric devices.

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