Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 755 · 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 120°?
2. 2.🦾 A servo program runs:
   angle = 80
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
9. 9.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
13. 13.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
16. 16.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 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 up and right (d) points straight up
32. 32.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
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 up and left (b) points up and right (c) points right (d) points straight up

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