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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 333 · 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.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
  6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  8. 8.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
  9. 9.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  11. 11.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 50
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  12. 12.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  13. 13.🦾 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 left (b) points right (c) points up and left (d) points straight up
  14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 70° to 140°. How many degrees does it turn?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  17. 17.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  19. 19.🦾 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 left (b) points straight up (c) points right (d) points up and left
  20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
  24. 24.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
  25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  27. 27.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
  28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
  30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  31. 31.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  32. 32.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  34. 34.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
  35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a servo motor
  2. a servo motor
  3. True
  4. 70
  5. 180°
  6. movement
  7. False
  8. 60
  9. 80
  10. 300
  11. 10
  12. False
  13. points straight up
  14. 50
  15. 70
  16. 200
  17. 50
  18. swap its two wires
  19. points right
  20. a DC motor
  21. a servo motor
  22. 70
  23. 10
  24. 30
  25. False
  26. a DC motor
  27. 40
  28. 80
  29. a DC motor
  30. a DC motor
  31. True
  32. True
  33. 100
  34. 100
  35. True
  36. 90
  37. False
  38. a servo motor
  39. 90
  40. 120

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