Is 12v AC or DC?

Related questions

1. Why zener diode is used as a voltage regulator?
2. Do voltage regulators need capacitors?
3. Is a voltage regulator necessary?
4. Why is zener diode heavily doped?
5. What happens if the voltage regulator goes bad?
6. Why zener diode is reverse biased?
7. What is DC source?
8. How does IC 7805 work?
9. Can zener diode be used as switch?
10. What is a negative voltage regulator?

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