Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 327 · 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 DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
3. 3.🦾 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 straight up (b) points left (c) points up and right (d) points right
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo program runs:
   angle = 0
   angle = angle + 60
   angle = angle + 20
   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 180°?
8. 8.🦾 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 right (b) points left (c) points up and right (d) points up and left
9. 9.🦾 A servo program runs:
   angle = 160
   angle = angle + 10
   angle = angle − 40
   angle = angle − 60
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
14. 14.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
15. 15.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
19. 19.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 60
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 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 left (c) points straight up (d) points up and right
30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 10
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 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 left (b) points up and left (c) points up and right (d) points right
40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

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