Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 617 · 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 = 0
   angle = angle + 10
   angle = angle + 30
   angle = angle − 30
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
4. 4.🦾 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 up and left (d) points left
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
6. 6.🦾 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 right (b) points right (c) points straight up (d) points left
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 left (c) points up and right (d) points up and left
17. 17.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
18. 18.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 10
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 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 left (b) points straight up (c) points up and left (d) points up and right
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
35. 35.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False

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