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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 753 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  4. 4.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  6. 6.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  10. 10.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
  12. 12.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
  13. 13.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
  14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  15. 15.🦾 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 straight up (b) points left (c) points up and left (d) points up and right
  16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  17. 17.🦾 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 right (b) points straight up (c) points left (d) points up and left
  18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  23. 23.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 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 right (c) points straight up (d) points up and right
  26. 26.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  27. 27.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  32. 32.🦾 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 up and right (c) points right (d) points straight up
  33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
  38. 38.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  39. 39.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. 50
  2. a servo motor
  3. False
  4. 20
  5. True
  6. False
  7. False
  8. False
  9. True
  10. 140
  11. 110
  12. 20
  13. 40
  14. False
  15. points up and left
  16. a DC motor
  17. points straight up
  18. a DC motor
  19. a servo motor
  20. 100
  21. a servo motor
  22. 120
  23. False
  24. 140
  25. points up and right
  26. True
  27. False
  28. 90
  29. 50
  30. True
  31. 250
  32. points right
  33. 120
  34. swap its two wires
  35. 200
  36. a DC motor
  37. 70
  38. movement
  39. True
  40. 150

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