Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 396 · 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.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
2. 2.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.🦾 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 left (b) points left (c) points right (d) points straight up
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
10. 10.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.🦾 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 right (b) points left (c) points straight up (d) points up and left
15. 15.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
17. 17.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.🦾 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 up and right (b) points up and left (c) points left (d) points straight up
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 50
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
37. 37.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
38. 38.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True

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