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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 295 · 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 program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points up and right (c) points right (d) points left
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  4. 4.🦾 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 straight up (b) points right (c) points left (d) points up and right
  5. 5.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  7. 7.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
  8. 8.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
  9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 50
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
  12. 12.🦾 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 left (d) points straight up
  13. 13.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  16. 16.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
  17. 17.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
  18. 18.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  21. 21.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
  22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
  24. 24.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
  25. 25.⚙️ 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
  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 program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo moves from 140° to 120°. How many degrees does it turn?
  34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle + 60
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

Answer key

  1. 30
  2. points left
  3. 200
  4. points up and right
  5. True
  6. 50
  7. 180°
  8. 50
  9. a DC motor
  10. 60
  11. 70
  12. points straight up
  13. 100
  14. a DC motor
  15. a DC motor
  16. movement
  17. 10
  18. True
  19. True
  20. True
  21. 30
  22. False
  23. a DC motor
  24. 70
  25. a servo motor
  26. a servo motor
  27. 170
  28. 100
  29. 80
  30. False
  31. a servo motor
  32. False
  33. 20
  34. 60
  35. 100
  36. 50
  37. True
  38. 150
  39. 250
  40. a servo motor

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