Question

Write any two sources which produce a direct current

Answer 1

1. DC is produced in the generating station or power station .
2.production and distribution of DC is comparatively convenient and economical than that of AC.

Answer 2

Here's your answer :
There are several sources of direct current and some are better than others and depends on the energy source:
1. Batteries
2. Photonic devices - photo cells
3. Static electricity
4. Chemical reactions
5. Lightening
6. Thermocouples - heated dissimilar metals

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