Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 881 · 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 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 up and right (d) points right
2. 2.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
10. 10.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
11. 11.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
16. 16.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 60
    angle = angle − 20
    angle = angle − 10
    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.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.🦾 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 right (b) points up and right (c) points left (d) points up and left
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
24. 24.🦾 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 up and right (b) points right (c) points up and left (d) points straight up
25. 25.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
28. 28.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
30. 30.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
33. 33.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
36. 36.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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