Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 972 · 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 spins faster with more V? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 40
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
4. 4.🦾 A servo program runs:
   angle = 100
   angle = angle − 30
   angle = angle − 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
7. 7.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 40
   angle = angle + 50
   angle = angle − 10
   angle = angle − 20
   angle = angle + 40
   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 straight up (b) points right (c) points up and right (d) points left
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 10
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
17. 17.🦾 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 right (b) points up and right (c) points up and left (d) points left
18. 18.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.🦾 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 up and right (c) points left (d) points straight up
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
27. 27.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.🦾 A servo moves from 180° to 130°. How many degrees does it turn?
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 up and left (b) points straight up (c) points left (d) points right
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 30° to 120°. How many degrees does it turn?

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