Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 341 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo program runs:
   angle = 150
   angle = angle + 10
   angle = angle − 60
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 50
   angle = angle + 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 80
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
8. 8.🦾 A servo program runs:
   angle = 80
   angle = angle + 10
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
15. 15.🦾 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 straight up (c) points left (d) points up and right
16. 16.🦾 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 up and left (c) points right (d) points left
17. 17.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 50
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
35. 35.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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