Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 998 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
3. 3.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
8. 8.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
17. 17.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
24. 24.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
25. 25.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
26. 26.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 20
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
32. 32.🦾 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 left (b) points right (c) points straight up (d) points up and right
33. 33.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
34. 34.🦾 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 up and left (b) points right (c) points left (d) points up and right
35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
39. 39.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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