Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 338 · 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.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 40
   angle = angle + 60
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 60
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo program runs:
   angle = 140
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 80
   angle = angle + 40
   angle = angle + 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 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 straight up (b) points left (c) points up and right (d) points right
10. 10.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
14. 14.🦾 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 straight up (c) points right (d) points up and right
15. 15.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
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 moves from 100° to 160°. How many degrees does it turn?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
38. 38.🦾 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 straight up (d) points right
39. 39.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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