Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 424 · 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 program runs:
   angle = 180
   angle = angle − 40
   angle = angle + 20
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle + 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
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 right (b) points up and right (c) points up and left (d) points left
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
5. 5.🦾 A servo program runs:
   angle = 150
   angle = angle − 60
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
8. 8.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle − 60
   angle = angle − 20
   angle = angle − 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
13. 13.🦾 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 straight up (d) points right
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
31. 31.🦾 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 left (c) points right (d) points straight up
32. 32.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 60
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 10
    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 = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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