Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 127 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
6. 6.⚙️ 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
7. 7.🦾 A servo program runs:
   angle = 110
   angle = angle + 20
   angle = angle − 60
   angle = angle + 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle + 10
   angle = angle − 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
13. 13.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 30
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
17. 17.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
18. 18.🦾 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 straight up (b) points left (c) points up and left (d) points right
19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
22. 22.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
27. 27.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
28. 28.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 10
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.🦾 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 left (c) points right (d) points straight up
36. 36.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
38. 38.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
40. 40.🦾 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 right (d) points up and right

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