Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 334 · 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.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 60
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
6. 6.🦾 A servo program runs:
   angle = 30
   angle = angle − 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo program runs:
   angle = 60
   angle = angle − 30
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
9. 9.🦾 A servo program runs:
   angle = 70
   angle = angle − 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 30
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
16. 16.🦾 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 left (b) points up and right (c) points right (d) points up and left
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
20. 20.🦾 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 left (b) points straight up (c) points up and right (d) points left
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
22. 22.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
26. 26.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
34. 34.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
35. 35.🦾 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 right (c) points straight up (d) points left
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?

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