What is DC current used for?

Related questions

1. Where is DC used?
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3. What is the difference between line and load regulation?
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5. Why zener diode is used as a voltage regulator?
6. Why do we use regulators?
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Tags

1. #direct
2. #alternating
3. #voltage
4. #electric
5. #circuits
6. #current
7. #direction
8. #changes
9. #flows
10. #charge
11. #periodically
12. #because
13. #other
14. #reverses