Why PWM techniques are used?

Related questions

1. Can I connect a 3 pin fan to a 4 pin connector?
2. What does a PWM fan mean?
3. Can you plug fans into PSU?
4. Can I use a CPU fan header for a case fan?
5. Can 3 pin fan be controlled?
6. What is a 4 pin PWM fan?
7. What is PWM fan?
8. How is fan speed controlled?
9. What is fan pump?
10. What is a chassis fan connector?

Tags

1. #content
2. #objective
3. #output
4. #these
5. #voltage
6. #techniques
7. #switching
8. #mainly
9. #reduce
10. #control
11. #modulation
12. #devices
13. #width
14. #efficient
15. #pulse
16. #inverter
17. #harmonic
18. #drives