Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 329 · 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 moves from 180° to 110°. How many degrees does it turn?
3. 3.🦾 A servo program runs:
   angle = 120
   angle = angle + 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 110
   angle = angle + 20
   angle = angle − 60
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
7. 7.🦾 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 up and left (d) points straight up
8. 8.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
9. 9.🦾 A servo program runs:
   angle = 150
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
12. 12.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.🦾 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 right (b) points up and left (c) points left (d) points right
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.🦾 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 straight up (d) points left
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle − 10
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 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 up and right (c) points left (d) points right
24. 24.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 50
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
33. 33.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
35. 35.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
37. 37.🦾 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
38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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