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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 314 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  2. 2.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  4. 4.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
  5. 5.🦾 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 left (b) points up and right (c) points straight up (d) points right
  6. 6.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  7. 7.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  9. 9.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
  10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points straight up (c) points up and left (d) points right
  15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  16. 16.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  17. 17.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
  18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  21. 21.🦾 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 right (b) points left (c) points right (d) points straight up
  22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  23. 23.🦾 A servo moves from 140° to 30°. How many degrees does it turn?
  24. 24.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  25. 25.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
  26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  27. 27.🦾 A servo moves from 140° to 90°. 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.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 10
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 30
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. False
  3. a servo motor
  4. 60
  5. points straight up
  6. 40
  7. 70
  8. a DC motor
  9. swap its two wires
  10. True
  11. 200
  12. 250
  13. True
  14. points up and left
  15. a DC motor
  16. True
  17. 150
  18. a servo motor
  19. a servo motor
  20. False
  21. points right
  22. a DC motor
  23. 110
  24. False
  25. 140
  26. True
  27. 50
  28. True
  29. 100
  30. 90
  31. True
  32. 70
  33. a servo motor
  34. False
  35. 90
  36. False
  37. 130
  38. 300
  39. 170
  40. 100

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