Can we amplify DC signal?

Related questions

1. Can an op amp amplify DC voltage?
2. Are amplifiers AC or DC?
3. What is the difference between transistor and amplifier?
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5. Does resistor limit voltage?
6. Do resistors lower voltage or current?
7. How do op amps work?
8. Is diode a linear device?
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10. Why op amps are called linear devices?

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