How does a variable power supply work?

Related questions

1. What is input voltage range?
2. How does a capacitor regulate voltage?
3. Do resistors reduce voltage or current?
4. Can resistor reduce voltage?
5. How do capacitors stabilize voltage?
6. How does IC 7805 works?
7. Does a resistor resist current or voltage?
8. What causes voltage?
9. Does voltage stabilizer consume power?
10. What is input voltage?

Tags

1. #current
2. #voltage
3. #given
4. #circuitry
5. #adjust
6. #converts
7. #output
8. #desired
9. #which
10. #power
11. #hardware
12. #battery
13. #facilitates
14. #versa
15. #variable
16. #supply