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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 43 · 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.🦾 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 right (b) points up and right (c) points up and left (d) points left
  3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  6. 6.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  7. 7.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 40
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  8. 8.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
  9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
  10. 10.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
  11. 11.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
  13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  14. 14.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  16. 16.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  17. 17.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  18. 18.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
  20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 10
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  24. 24.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  28. 28.🦾 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 right (c) points up and left (d) points left
  29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
  31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  33. 33.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  35. 35.🦾 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 straight up (c) points right (d) points up and right
  36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  37. 37.🦾 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 left
  38. 38.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. a servo motor
  2. points up and left
  3. False
  4. 60
  5. a DC motor
  6. False
  7. 50
  8. 50
  9. a DC motor
  10. 60
  11. False
  12. 80
  13. True
  14. movement
  15. 180°
  16. True
  17. False
  18. True
  19. swap its two wires
  20. 70
  21. True
  22. a servo motor
  23. a servo motor
  24. 80
  25. 120
  26. 100
  27. a DC motor
  28. points left
  29. 140
  30. 10
  31. True
  32. 200
  33. 90
  34. False
  35. points straight up
  36. a servo motor
  37. points right
  38. 70
  39. 50
  40. 150

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