Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 239 · 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.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
2. 2.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle + 10
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
7. 7.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 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 up and left (c) points straight up (d) points left
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.⚙️ 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
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 right (c) points up and right (d) points left
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.🦾 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 up and left (c) points up and right (d) points left
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.🦾 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 up and left (d) points straight up
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
25. 25.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
36. 36.🦾 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 right (b) points right (c) points straight up (d) points up and left
37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 20
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
39. 39.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
40. 40.🦾 A servo moves from 40° to 170°. How many degrees does it turn?

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