Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 656 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
3. 3.🦾 A servo program runs:
   angle = 100
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 140
   angle = angle + 10
   angle = angle − 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
10. 10.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
13. 13.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
16. 16.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points up and left
18. 18.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
26. 26.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points left
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
35. 35.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 0° to 60°. How many degrees does it turn?

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