Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 745 · 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 has a signal wire? (a) a DC motor (b) a servo motor
2. 2.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
4. 4.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle − 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
8. 8.🦾 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 straight up (b) points up and left (c) points up and right (d) points left
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 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 left (b) points right (c) points left (d) points straight up
15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 60° to 80°. 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 90°. Where does the arm point? (a) points up and right (b) points right (c) points left (d) points straight up
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
24. 24.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
32. 32.🦾 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 up and right (b) points straight up (c) points left (d) points right
33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 right (c) points up and left (d) points straight up
37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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