Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 991 · 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 program runs:
   angle = 120
   angle = angle + 10
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 40
   angle = angle − 20
   angle = angle − 50
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 10
   angle = angle + 30
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
10. 10.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🦾 A servo moves from 180° to 140°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
21. 21.🦾 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 left (c) points straight up (d) points right
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
24. 24.🦾 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
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
26. 26.True or false: “reverses if wires swap” is true of a servo 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 moves from 120° to 170°. How many degrees does it turn?
29. 29.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
32. 32.⚙️ 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
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False

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