Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 520 · 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 180°?
2. 2.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
3. 3.🦾 A servo program runs:
   angle = 40
   angle = angle + 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 160
   angle = angle + 10
   angle = angle − 50
   angle = angle + 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
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 DC motor (d) a buzzer
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
10. 10.⚙️ 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
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
12. 12.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 40
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 left (b) points right (c) points straight up (d) points up and right
19. 19.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
20. 20.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
28. 28.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 30
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🦾 A servo moves from 150° to 0°. How many degrees does it turn?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
40. 40.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False

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