Why is PWM used to control motors?

Related questions

1. Why is PWM more efficient?
2. What are the advantages of pulse width modulation?
3. How is PWM signal generated?
4. Can you plug a 3 pin into a 4 pin?
5. How do you calculate frequency and pulse width?
6. What is PWM pin in Arduino?
7. Does PWM reduce torque?
8. How is PWM duty cycle calculated?
9. What are the application of PWM?
10. Can 3 pin fans be controlled by motherboard?

Tags

1. #modulation
2. #motor
3. #terminals
4. #achieved
5. #width
6. #simple
7. #regulate
8. #speed
9. #resistance
10. #voltage
11. #across
12. #wasted
13. #using
14. #pulse
15. #power
16. #racing
17. #control
18. #while
19. #scalextric
20. #generates
21. #amount