Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 819 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
4. 4.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 150
   angle = angle − 60
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
7. 7.🦾 A servo program runs:
   angle = 110
   angle = angle − 30
   angle = angle + 10
   angle = angle − 30
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle − 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points up and left
12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points left
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points left
35. 35.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

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